[Deburring Tool] Quickly repair damaged/flattened bolts and tighten nuts without hurting your hands or; Accessory bolt tube size: 3mm to 20mm). [Industrial Grade Material] Made of extremely hard tungsten steel, it has high strength and hardness, is durable, rust-proof and corrosion-resistant. Three tungsten steel blades have powerful cutting and repairing capabilities, and can remove burrs more cleanly and effectively. [Safe and Efficient] This deburring external chamfering tool can shave off the outer edge of flattened bolts. Just connect it to the electric drill and gently press on the bolt head. Simplifies the repair process without replacing expensive or hard-to-find hardware. [Easy to Use] Quickly slap it into the chuck drill using the appropriate speed and feed-the drill uses 0-400 RPM, and then apply a little pressure to remove burrs. The 1/4-inch hexagonal is designed with a quick release and fits most drills, including lithium-ion drills/hand drills/bench drills. [Widely Used] Use this deburring chamfer drill bit to repair metals such as stainless steel, hardened steel, mild steel, brass, copper, aluminum, fiberglass and even wood or plastic. Simple design and compact size, it is very convenient to use and easy to carry around in your toolbox. Color: Black Material: Tungsten Steel Size: 3-20mm Package Contents: 1 * Deburring External Chamfer Only the above package contents, other products are not included. Note: Light reflection and different monitors may cause the color of the item in the picture to be slightly different from the actual item. The measurement allowable error is +/- 1-3 cm.