Product Specification

3-Piece Titanium Nitride Coated HSS Step Drill Bit Set | Professional-Grade Performance for Metal, Electrical & Plumbing Work

Boost productivity and precision with the XINGRUI 3-Piece HSS Step Drill Bit Set, engineered for professionals who demand reliability and accuracy. Each bit is crafted from premium High-Speed Steel (HSS) and coated with Titanium Nitride (TiN) for unmatched durability, reduced heat, and faster cutting. Designed for clean, burr-free holes in steel, aluminum, brass, copper, and plastic, this set is ideal for metal fabrication, electrical installation, plumbing, and automotive applications.

Key Features & Benefits

1. Industrial-Grade HSS Construction
Manufactured from high-quality HSS material, each bit undergoes a full hardening and tempering process for superior toughness, strength, and edge retention. Perfect for daily professional use in workshops or on-site.

2. Titanium Nitride (TiN) Coating – Gold Finish
The TiN coating creates a super-hard surface layer that reduces friction and heat build-up by up to 50%. This significantly extends tool life and ensures smooth, fast drilling, even in stainless steel or other hard metals.

3. Precision CNC-Ground Steps
Each step is CNC precision-ground for accurate hole sizing and fast chip evacuation. Integrated deburring edges ensure a clean, ready-to-use hole with no need for secondary finishing.

4. 135° Split Point Self-Centering Tip
The sharp tip eliminates “walking” and provides effortless, pinpoint starting on curved or smooth surfaces. Delivers consistent results and perfect hole alignment.

5. Professional Metal Storage Case
The heavy-duty, labeled metal case keeps your bits protected, organized, and portable — ideal for electricians, fabricators, and mechanics on the move.

Technical Specifications

Applications.

Electrical Work: Easily drill precise holes in switch boxes and control panels.

Metal Fabrication & HVAC: Ideal for enlarging existing holes, duct fabrication, and thin metal sheet work (up to 4mm).

Plumbing & Automotive: Excellent for PVC pipes, vehicle panels, or custom brackets.

DIY & MRO Projects: A versatile solution for maintenance and repair professionals.

How to Use for Best Performance
Speed: Operate between 300–800 RPM with steady pressure.

Lubrication: Use cutting oil for metals to minimize friction and extend tool life.

Compatibility: Use with standard drills or drill presses. Avoid impact drivers to protect cutting edges.

FAQ

Q: What is the benefit of TiN coating?
A: Titanium Nitride provides a harder surface and lower friction, allowing faster cutting and up to 6× longer lifespan compared to uncoated HSS bits.

Q: Can these drill thick steel plates?
A: Step drill bits are designed for thin sheet metal (3–5mm per step). For thick plates, use standard twist drills.

Q: Are these suitable for daily professional use?
A: Yes — the combination of hardened HSS, TiN coating, and precision grinding ensures durability and performance for continuous use in industrial environments.

3-Piece TiN Coated HSS Step Drill Bit Set | Professional Grade for Metal, Electrical & Plumbing Achieve workshop efficiency with our professional 3-Piece Step Drill Bit Set. Engineered from High-Speed Steel (HSS) and enhanced with a high-performance Titanium Nitride (TiN) coating, these bits are built to last longer, run cooler, and drill faster through tough materials. The precision-ground steps and self-centering tip allow you to drill multiple hole sizes perfectly and deburr in one swift operation, eliminating the need for multiple tools. Unmatched Durability & Precision Engineering Premium HSS Material & Heat Treatment: Crafted from high-grade High-Speed Steel that undergoes a precise hardening and tempering process. This creates a tough, resilient core that resists chipping and maintains sharpness under pressure, ensuring a long tool life. Advanced TiN (Titanium Nitride) Coating: The distinctive gold TiN coating is not just for looks. It creates an ultra-hard surface that reduces friction and heat buildup by up to 50%. This results in a significantly extended bit life, allowing for faster cutting speeds and improved performance in steel and other hard metals. Fully Ground Flutes & Steps: Each step is meticulously CNC-ground to a sharp, precise edge. This advanced manufacturing process ensures clean, accurate cuts with smooth chip evacuation and includes an integrated deburring edge for a finished hole ready for use. 135° Self-Centering Tip: Saves time and improves accuracy. The sharp tip bites instantly, preventing the bit from "walking" or skidding on curved surfaces, guaranteeing perfect hole placement every time. Professional Metal Storage Case: Includes a robust, labeled metal case for secure storage, easy organization, and portability, protecting your investment on any job site. Technical Specifications & Applications at a Glance Feature Specification Material High-Grade High-Speed Steel (HSS) Production Process Hardened & Tempered, CNC-Ground Flutes Surface Coating Titanium Nitride (TiN) - Gold Shank Type Round Shank (fits all standard 3-jaw drill chucks) Point Angle 135° Self-Centering Sizes Included Bit 1: 4 - 12 mm Bit 2: 4 - 20 mm Bit 3: 4 - 30 mm Application Materials Mild Steel, Stainless Steel (thin gauge), Aluminum, Copper, Brass, PVC, Plastic Professional Applications Electrical Work: The perfect tool for quickly and cleanly installing outlets and switches in electrical boxes and panels. Metal Fabrication & HVAC: Ideal for enlarging holes, fabricating ducts, and working on sheet metal up to 4mm thick. Plumbing & Automotive: Excellent for drilling and deburring holes in PVC pipes, automotive body panels, and creating custom brackets. General DIY & MRO: A versatile, time-saving set for countless maintenance, repair, and home improvement projects. How to Use for Optimal Results Use a Steady Speed: Operate at a medium RPM (300-800) with consistent, firm pressure. Let the bit's sharp edges do the cutting. Lubrication is Key: For steel and stainless steel, apply cutting oil to further reduce heat, extend bit life, and achieve a smoother finish. Tool Compatibility: For best results, use in a standard drill or drill press. Not recommended for impact drivers, as the hammering action can damage the precise cutting edges. FAQ Q: Why is the TiN coating beneficial? A: The Titanium Nitride coating increases surface hardness, reduces friction, and dissipates heat better, making the bit last up to 6x longer than uncoated HSS bits. Q: Can this set drill through thick metal? A: Step bits are designed for sheet materials. They are most effective on materials within the thickness of one step (approx. 3-5mm). For thicker block metal, standard twist drills are more appropriate. Q: Is this set suitable for professional daily use? A: Absolutely. The combination of hardened HSS, TiN coating, and precision grinding makes this set robust enough for professional workshop and job site environments. Need Imperial Sizes? Explore our range of step drill bits with fractional inch measurements for all your project needs!3-Piece TiN Coated HSS Step Drill Bit Set | Professional Grade for Metal, Electrical & Plumbing Achieve workshop efficiency with our professional 3-Piece Step Drill Bit Set. Engineered from High-Speed Steel (HSS) and enhanced with a high-performance Titanium Nitride (TiN) coating, these bits are built to last longer, run cooler, and drill faster through tough materials. The precision-ground steps and self-centering tip allow you to drill multiple hole sizes perfectly and deburr in one swift operation, eliminating the need for multiple tools. Unmatched Durability & Precision Engineering Premium HSS Material & Heat Treatment: Crafted from high-grade High-Speed Steel that undergoes a precise hardening and tempering process. This creates a tough, resilient core that resists chipping and maintains sharpness under pressure, ensuring a long tool life. Advanced TiN (Titanium Nitride) Coating: The distinctive gold TiN coating is not just for looks. It creates an ultra-hard surface that reduces friction and heat buildup by up to 50%. This results in a significantly extended bit life, allowing for faster cutting speeds and improved performance in steel and other hard metals. Fully Ground Flutes & Steps: Each step is meticulously CNC-ground to a sharp, precise edge. This advanced manufacturing process ensures clean, accurate cuts with smooth chip evacuation and includes an integrated deburring edge for a finished hole ready for use. 135° Self-Centering Tip: Saves time and improves accuracy. The sharp tip bites instantly, preventing the bit from "walking" or skidding on curved surfaces, guaranteeing perfect hole placement every time. Professional Metal Storage Case: Includes a robust, labeled metal case for secure storage, easy organization, and portability, protecting your investment on any job site. Technical Specifications & Applications at a Glance Feature Specification Material High-Grade High-Speed Steel (HSS) Production Process Hardened & Tempered, CNC-Ground Flutes Surface Coating Titanium Nitride (TiN) - Gold Shank Type Round Shank (fits all standard 3-jaw drill chucks) Point Angle 135° Self-Centering Sizes Included Bit 1: 4 - 12 mm Bit 2: 4 - 20 mm Bit 3: 4 - 30 mm Application Materials Mild Steel, Stainless Steel (thin gauge), Aluminum, Copper, Brass, PVC, Plastic Professional Applications Electrical Work: The perfect tool for quickly and cleanly installing outlets and switches in electrical boxes and panels. Metal Fabrication & HVAC: Ideal for enlarging holes, fabricating ducts, and working on sheet metal up to 4mm thick. Plumbing & Automotive: Excellent for drilling and deburring holes in PVC pipes, automotive body panels, and creating custom brackets. General DIY & MRO: A versatile, time-saving set for countless maintenance, repair, and home improvement projects. How to Use for Optimal Results Use a Steady Speed: Operate at a medium RPM (300-800) with consistent, firm pressure. Let the bit's sharp edges do the cutting. Lubrication is Key: For steel and stainless steel, apply cutting oil to further reduce heat, extend bit life, and achieve a smoother finish. Tool Compatibility: For best results, use in a standard drill or drill press. Not recommended for impact drivers, as the hammering action can damage the precise cutting edges. FAQ Q: Why is the TiN coating beneficial? A: The Titanium Nitride coating increases surface hardness, reduces friction, and dissipates heat better, making the bit last up to 6x longer than uncoated HSS bits. Q: Can this set drill through thick metal? A: Step bits are designed for sheet materials. They are most effective on materials within the thickness of one step (approx. 3-5mm). For thicker block metal, standard twist drills are more appropriate. Q: Is this set suitable for professional daily use? A: Absolutely. The combination of hardened HSS, TiN coating, and precision grinding makes this set robust enough for professional workshop and job site environments. Need Imperial Sizes? Explore our range of step drill bits with fractional inch measurements for all your project needs3-Piece TiN Coated HSS Step Drill Bit Set | Professional Grade for Metal, Electrical & Plumbing Achieve workshop efficiency with our professional 3-Piece Step Drill Bit Set. Engineered from High-Speed Steel (HSS) and enhanced with a high-performance Titanium Nitride (TiN) coating, these bits are built to last longer, run cooler, and drill faster through tough materials. The precision-ground steps and self-centering tip allow you to drill multiple hole sizes perfectly and deburr in one swift operation, eliminating the need for multiple tools. Unmatched Durability & Precision Engineering Premium HSS Material & Heat Treatment: Crafted from high-grade High-Speed Steel that undergoes a precise hardening and tempering process. This creates a tough, resilient core that resists chipping and maintains sharpness under pressure, ensuring a long tool life. Advanced TiN (Titanium Nitride) Coating: The distinctive gold TiN coating is not just for looks. It creates an ultra-hard surface that reduces friction and heat buildup by up to 50%. This results in a significantly extended bit life, allowing for faster cutting speeds and improved performance in steel and other hard metals. Fully Ground Flutes & Steps: Each step is meticulously CNC-ground to a sharp, precise edge. This advanced manufacturing process ensures clean, accurate cuts with smooth chip evacuation and includes an integrated deburring edge for a finished hole ready for use. 135° Self-Centering Tip: Saves time and improves accuracy. The sharp tip bites instantly, preventing the bit from "walking" or skidding on curved surfaces, guaranteeing perfect hole placement every time. Professional Metal Storage Case: Includes a robust, labeled metal case for secure storage, easy organization, and portability, protecting your investment on any job site. Technical Specifications & Applications at a Glance Feature Specification Material High-Grade High-Speed Steel (HSS) Production Process Hardened & Tempered, CNC-Ground Flutes Surface Coating Titanium Nitride (TiN) - Gold Shank Type Round Shank (fits all standard 3-jaw drill chucks) Point Angle 135° Self-Centering Sizes Included Bit 1: 4 - 12 mm Bit 2: 4 - 20 mm Bit 3: 4 - 30 mm Application Materials Mild Steel, Stainless Steel (thin gauge), Aluminum, Copper, Brass, PVC, Plastic Professional Applications Electrical Work: The perfect tool for quickly and cleanly installing outlets and switches in electrical boxes and panels. Metal Fabrication & HVAC: Ideal for enlarging holes, fabricating ducts, and working on sheet metal up to 4mm thick. Plumbing & Automotive: Excellent for drilling and deburring holes in PVC pipes, automotive body panels, and creating custom brackets. General DIY & MRO: A versatile, time-saving set for countless maintenance, repair, and home improvement projects. How to Use for Optimal Results Use a Steady Speed: Operate at a medium RPM (300-800) with consistent, firm pressure. Let the bit's sharp edges do the cutting. Lubrication is Key: For steel and stainless steel, apply cutting oil to further reduce heat, extend bit life, and achieve a smoother finish. Tool Compatibility: For best results, use in a standard drill or drill press. Not recommended for impact drivers, as the hammering action can damage the precise cutting edges. FAQ Q: Why is the TiN coating beneficial? A: The Titanium Nitride coating increases surface hardness, reduces friction, and dissipates heat better, making the bit last up to 6x longer than uncoated HSS bits. Q: Can this set drill through thick metal? A: Step bits are designed for sheet materials. They are most effective on materials within the thickness of one step (approx. 3-5mm). For thicker block metal, standard twist drills are more appropriate. Q: Is this set suitable for professional daily use? A: Absolutely. The combination of hardened HSS, TiN coating, and precision grinding makes this set robust enough for professional workshop and job site environments. Need Imperial Sizes? Explore our range of step drill bits with fractional inch measurements for all your project needs!

3-Piece TiN Coated HSS Step Drill Bit Set | Professional Grade for Metal, Electrical & Plumbing Achieve workshop efficiency with our professional 3-Piece Step Drill Bit Set. Engineered from High-Speed Steel (HSS) and enhanced with a high-performance Titanium Nitride (TiN) coating, these bits are built to last longer, run cooler, and drill faster through tough materials. The precision-ground steps and self-centering tip allow you to drill multiple hole sizes perfectly and deburr in one swift operation, eliminating the need for multiple tools. Unmatched Durability & Precision Engineering Premium HSS Material & Heat Treatment: Crafted from high-grade High-Speed Steel that undergoes a precise hardening and tempering process. This creates a tough, resilient core that resists chipping and maintains sharpness under pressure, ensuring a long tool life. Advanced TiN (Titanium Nitride) Coating: The distinctive gold TiN coating is not just for looks. It creates an ultra-hard surface that reduces friction and heat buildup by up to 50%. This results in a significantly extended bit life, allowing for faster cutting speeds and improved performance in steel and other hard metals. Fully Ground Flutes & Steps: Each step is meticulously CNC-ground to a sharp, precise edge. This advanced manufacturing process ensures clean, accurate cuts with smooth chip evacuation and includes an integrated deburring edge for a finished hole ready for use. 135° Self-Centering Tip: Saves time and improves accuracy. The sharp tip bites instantly, preventing the bit from "walking" or skidding on curved surfaces, guaranteeing perfect hole placement every time. Professional Metal Storage Case: Includes a robust, labeled metal case for secure storage, easy organization, and portability, protecting your investment on any job site. Technical Specifications & Applications at a Glance Feature Specification Material High-Grade High-Speed Steel (HSS) Production Process Hardened & Tempered, CNC-Ground Flutes Surface Coating Titanium Nitride (TiN) - Gold Shank Type Round Shank (fits all standard 3-jaw drill chucks) Point Angle 135° Self-Centering Sizes Included Bit 1: 4 - 12 mm Bit 2: 4 - 20 mm Bit 3: 4 - 30 mm Application Materials Mild Steel, Stainless Steel (thin gauge), Aluminum, Copper, Brass, PVC, Plastic Professional Applications Electrical Work: The perfect tool for quickly and cleanly installing outlets and switches in electrical boxes and panels. Metal Fabrication & HVAC: Ideal for enlarging holes, fabricating ducts, and working on sheet metal up to 4mm thick. Plumbing & Automotive: Excellent for drilling and deburring holes in PVC pipes, automotive body panels, and creating custom brackets. General DIY & MRO: A versatile, time-saving set for countless maintenance, repair, and home improvement projects. How to Use for Optimal Results Use a Steady Speed: Operate at a medium RPM (300-800) with consistent, firm pressure. Let the bit's sharp edges do the cutting. Lubrication is Key: For steel and stainless steel, apply cutting oil to further reduce heat, extend bit life, and achieve a smoother finish. Tool Compatibility: For best results, use in a standard drill or drill press. Not recommended for impact drivers, as the hammering action can damage the precise cutting edges. FAQ Q: Why is the TiN coating beneficial? A: The Titanium Nitride coating increases surface hardness, reduces friction, and dissipates heat better, making the bit last up to 6x longer than uncoated HSS bits. Q: Can this set drill through thick metal? A: Step bits are designed for sheet materials. They are most effective on materials within the thickness of one step (approx. 3-5mm). For thicker block metal, standard twist drills are more appropriate. Q: Is this set suitable for professional daily use? A: Absolutely. The combination of hardened HSS, TiN coating, and precision grinding makes this set robust enough for professional workshop and job site environments. Need Imperial Sizes? Explore our range of step drill bits with fractional inch measurements for all your project needs!p drill bits with fractional inch measurements for all your project needs!