hardness depth 8 12mm bottom track roller

{"cid":"91190803","title":"DAEWOO DH55 DH130 DH220 Excavator Track Roller with Surface Hardness HRC52-58 Hardness Depth 8-12mm and 40Mn2\/40MnB\/50Mn Material","imgUrl":"https:\/\/img.chinax.com\/nimg\/c9\/ff\/ef6bd3d9a8857e5f222edf2fccb9-200x200-1.jpg","attrs":{"Price":"Negotiable","Brand Name":"YT","Model Number":"DH55 DH130 DH220","Minimum Order Quantity":"1PCS","Delivery Time":"7-30 Days","Place of Origin":"China(Mainland)","Payment Terms":"L\/C,T\/T","Supply Ability":"10000 PCS\/Month","Packaging Details":"Export Packaging","Material":"40Mn2\u300140MnB\u300150Mn","Technique":"Forging\/Casting","Colour":"Yellow or Black or Customer Required","Shipment":"By Air, Ship and Express","Surface Hardness":"HRC52-58","Certification":"ISO9001: 2000","Weight":"Optional","Hardness Depth":"8-12mm"}}

{"cid":"91213915","title":"Ex55 Mini Digger Track Rollers Construction Machinery Parts HRC50-56","imgUrl":"https:\/\/img.chinax.com\/nimg\/5d\/49\/7ed70b64207269b9d7d44c041513-200x200-1.jpg","attrs":{"Price":"USD 50\/Piece","Brand Name":"Shantui Sumitomo Hyundai Komatsu Kobelco VOLVO Doosan","Model Number":"EX55","Minimum Order Quantity":"10 Pieces","Delivery Time":"Negotiable according to quantity","Certifiion":"ISO\\CE","Place of Origin":"Fujian\uff0cChina","Payment Terms":"L\/C, T\/T","Supply Ability":"5000 Piece\/Pieces per Month","Packaging Details":"In strong fumigate wooden pallet in container or by requirement.","Condition:":"NEW","Applicable Industries:":"Machinery Repair Shops, Construction works , Energy & Minin...","After Warranty Service:":"Online support","After-sales Service Provided:":"Online support","Type:":"Undercarriage Parts","Heat treatment:":"YES","Color:":"Yellow \/ Black","Technique:":"Forging, Casting, Machining, Heat Treatment"}}

{"cid":"91186469","title":"Mini Digger Spare Parts Mini Excavator Tracks With Finished Suface Treatment","imgUrl":"https:\/\/img.chinax.com\/nimg\/2d\/03\/1d093b0f8b7eab9c6d56268b105a-200x200-1.jpg","attrs":{"Price":"Negotiate","Brand Name":"Echoo","Model Number":"EX12","Minimum Order Quantity":"2PCS","Delivery Time":"3-7 working days","Place of Origin":"Xiamen, China","Payment Terms":"T\/T, Western Union,Pyapal","Supply Ability":"100000PCS\/ Month","Packaging Details":"Standard wooden pallet.","Application":"Hitachi excavator undercarriage parts","Model":"EX12","Keyword":"EX12 track chain assy","Warranty time":"1 year","Size":"Follow OEM Strictly","OEM brand":"Hitachi"}}