6 Pack Wire Brush Set for Drill Materials: Stainless steel wire + Metal.Shank diameter: 1/4-Inch ShankSizes: 3 " twist cup brush, 3 " copper-plated wire cup brush , 1" knot pen brush, 1" copper-plated pen brush, 2PACK Carbon wire wheel brush. Use for: Removing Rust/Corrosion/Paint High Quality Made of heavy duty High-Carbon 0.3 MM stainless steel wire, the wire wheel for drill is very strong with a long service life. Sharp &Long-lasting Hack down rust and old paint efficiently making it ready for metal primer after a wipe down. High-density uniform steel wire is tight and long-lasting, leaving a uniform, smooth surface.Innovative spiral knotted and Crimped wires brush construction. Satisfy Your Various Need The konted wire brush for heavy deburring, the copper-plated wire brush for gentle grinding. The cup brush for large area grinding, pen brush for narrow conner,which can clean thoroughly without residual stains. Warm Tip: 1. When installing the grinding head, please make sure the chuck can hold 6mm shank. Meanwhile, you can use a special wrench to tighten properly and check whether it is firm and strong. 2.For your safty, please make sure you wear SAFETY equipment such as a face shield (or Full Coverage Goggles) and gloves. 3. During the grinding, the operator should stand on top of the workpiece to prevent it from flying, chipping and hurt.Use the grinding head, the force should be increase slowly.