Item Type: Deburring Chamfering Device Material: Metal Largest Inner Diameter Opening: Approx. 21mm / 0.8in Weight: Approx. 138g / 4.86oz Purpose: Chamfering Device Package List 2 x Deburring Chamfering Device 1Quickly Repair: Quickly repair damaged bolts and tighten nuts in place, simplifying the repair process. 2Metal Cutting Method: The triangular handle chamfering device works with metal cutting layer by layer. 3Simple Operation: Use the lowest speed on the drill bit, and then slightly apply pressure to remove the burr. 4Chamfer Tool: Eliminating the need to replace expensive or hard to find hardware. Great helper for industry and household. 5Wide Use: The chamfer tool is effective on stainless steel, hardened steel, mild steel, copper, brass, aluminum, fiberglass, wood, plastic.