ZHANGJIAGANG FLAME MACHINERY CO.,LTD.
| Payment Terms | L/C, D/P, T/T, Western Union |
| Supply Ability | 300,0000PCS PER MOUTH |
| Delivery Time | 30-45days |
| Packaging Details | metal box |
| Type | Twist Drill Bit |
| Use | Metal Drilling |
| Material | HSS-4241 |
| Product name | 25PCS Drill Bit Set |
| Application | Drilling Holes,Stainless Steel,concrete etc. |
| Shank | Round/Three-flatted/Hex shank and so on |
| Process | Half Ground |
| Color | tin coated |
| Feature | Sharpness,High Speed.Straight Smooth Edge,Longer Working Life |
| Packing | Aluminium case or as your request |
| Brand Name | XRTOOLS |
| Model Number | 25PC |
| Certification | ISO9000 |
| Place of Origin | CHINA |
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Product Specification
| Payment Terms | L/C, D/P, T/T, Western Union | Supply Ability | 300,0000PCS PER MOUTH |
| Delivery Time | 30-45days | Packaging Details | metal box |
| Type | Twist Drill Bit | Use | Metal Drilling |
| Material | HSS-4241 | Product name | 25PCS Drill Bit Set |
| Application | Drilling Holes,Stainless Steel,concrete etc. | Shank | Round/Three-flatted/Hex shank and so on |
| Process | Half Ground | Color | tin coated |
| Feature | Sharpness,High Speed.Straight Smooth Edge,Longer Working Life | Packing | Aluminium case or as your request |
| Brand Name | XRTOOLS | Model Number | 25PC |
| Certification | ISO9000 | Place of Origin | CHINA |
| High Light | 4241 drill bit set ，4241 drill set twist ，round drill bit set | ||
Built for everyday drilling at a smart price, the XRTOOLS 25-piece 4241 HSS drill bit set uses a roll-forged, half-ground manufacturing process: flutes are roll-forged for toughness, then the cutting lips and lands are half-ground to improve sharpness, runout, and chip flow. The result is a reliable, general-purpose set for wood, plastics, aluminum, and mild steel—perfect for workshops, installers, and DIY users.
Tough & forgiving: Roll-forged 4241 HSS offers high impact tolerance and resists chipping during handheld drilling.
Sharper starts: Half-ground lips reduce burrs and walking versus fully roll-forged economy bits.
Clean holes, less heat: Refined land geometry + polished margins improve chip evacuation and reduce friction.
True jobber versatility: Jobber length and round shank fit any 3-jaw chuck—corded, cordless, or drill press.
Value that lasts: Better edge life than basic carbon-steel bits; easy to resharpen to extend service life.
Woodworking: pilot holes, cabinet hardware, shelf pins, joinery jigs.
Plastics & composites: PVC, ABS, acrylic panels (use light feed to avoid melting).
Light metals: aluminum profiles, thin brass/bronze, mild steel sheet and angle.
Maintenance & install: brackets, fixtures, electrical boxes, site fit-outs.
For stainless or hardened steel, choose cobalt grades (M35/M42).
| Feature | Details |
|---|---|
| Material | HSS 4241, roll-forged body with half-ground cutting lips |
| Point | 118° conventional point (easy to re-sharpen); 135° optional on OEM |
| Flutes | Roll-forged twist flutes; ground lands for better concentricity |
| Length Type | Jobber |
| Shank | Round, 3-jaw chuck compatible |
| Finish Options | Black oxide / Steam-tempered black / Bright (customer selectable) |
| Hardness (typ.) | ~HRC 60–62 after heat treatment |
| Recommended Materials | Wood, plastics, aluminum, mild steel (thin section) |
| Resharpenable | Yes—standard lip relief; bench grinder or jig recommended |
| 1.0 | 1.5 | 2.0 | 2.5 | 3.0 |
|---|---|---|---|---|
| 3.5 | 4.0 | 4.5 | 5.0 | 5.5 |
| 6.0 | 6.5 | 7.0 | 7.5 | 8.0 |
| 8.5 | 9.0 | 9.5 | 10.0 | 10.5 |
| 11.0 | 11.5 | 12.0 | 12.5 | 13.0 |
Imperial option (on request): 25-pc fractional assortment covering 1/16"–1/2" with a curated size map.
Mild steel: moderate RPM, steady feed, add cutting oil; peck to clear chips.
Aluminum: higher RPM, light oil for a bright finish.
Plastics: high RPM, light feed; back up the work to prevent breakout.
Bit care: if edges dull or chatter increases, dress lips evenly to restore symmetry.
Storage: metal or heavy-duty plastic indexed case with size callouts.
Retail pack: color sleeve + barcode; instruction insert available.
Bulk: 10–20 sets/inner, master cartons for distribution.
Private label: laser-etched logo, custom size maps (metric/imperial), finish choice, EN/RU bilingual labels and data sheets.
Q1: What’s the difference between roll-forged and fully ground?
A: Roll-forged is tougher and cost-effective; half-ground improves sharpness/runout versus economy bits. Fully ground offers the highest precision at higher cost.
Q2: Can these drill stainless steel?
A: Not recommended. Use M35/M42 cobalt for stainless or hardened steels.
Q3: Are these suitable for cordless drills?
A: Yes—jobber length, round shanks fit all standard 3-jaw chucks.
Q4: Can I get black & gold?
A: We offer black oxide or bright as standard. Black-and-gold (steam/oxide + polished lands) is available for OEM orders.
Company Details
Business Type:
Manufacturer,Exporter,Trading Company
Year Established:
2018
Total Annual:
500-600
Employee Number:
135~150
Ecer Certification：
Verified Supplier
Jiangsu Xing Rui Precision Tools Co., Ltd. is a leading manufacturer of high-quality cutting tools in China, established in 2008 and located in Danyang, Jiangsu Province—a major hub for cutting tool production with convenient transportation for global logistics. Main Products We speciali... Jiangsu Xing Rui Precision Tools Co., Ltd. is a leading manufacturer of high-quality cutting tools in China, established in 2008 and located in Danyang, Jiangsu Province—a major hub for cutting tool production with convenient transportation for global logistics. Main Products We speciali...
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