Fits bolts from size 8-32 (.164") up to 3/4-10 (.750") (4 mm – 19 mm). Material: High-speed steel (CR12MOV), offering high strength and hardness. Simple operation: Use at the lowest drill speed and apply light pressure to remove burrs. Quickly repairs damaged bolts and tightens nuts in place; simplifies repair and reduces the need to replace expensive or hard-to-find hardware. Effective on stainless steel, hardened steel, mild steel, copper, brass, aluminum, fiberglass, wood, and plastic—threaded or non-threaded. Note: This tool removes material by shearing metal layer by layer. For extended tool life, use at low speed, avoid unnecessary cutting, and apply cutting oil or lubricant. Color: Silver Includes: - 1 x Hexagon Shank External Deburring and Chamfer Tool - 1 x Triangular Shank External Deburring and Chamfer Tool Dimensions: 50 mm × 28 mm