Made of extremely hard alloy steel, with high strength and hardness, , rust-proof, and anti-; it can stay with you for a long time Size: Fits 1/8 in. (3 mm) to 1 in. (25 mm); operates with full lubrication and below 400 RPM EASY TO USE: This deburring exterior chamfering tool makes it easy to chip away at the outer edges of flat bolts. Simply attach it to the drill and lightly on the bolt head; easily and quickly secures the nut to be tightened Safe and efficient: The high-strength, high-hardness deburring drill bit can easily cut off the outer edges of bolts, pipes, and rods and remove burrs; quickly repair bolts and tighten the nuts in place without hurting your hands, producing , or burned. ; Simplify the maintenance process Wide range of applications - External chamfering tools effectively machine stainless steel, hardened steel, mild steel, copper, brass, aluminum, fiberglass, wood, plastic, with or without threads Colour:black+blue Material:high speed steel Package Contents: 4 x Chamfer Tool Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.