The Wire Cup Brush has twisted twines for that heavier task. The wires are twisted into tight spirals to maximize abrasive action thereby allowing for fast removal of heavy rust & paint. Can also be used for deburring, descaling and preparing welding seams. Designed for use with angle grinders, but also suitable for power drills when used with an adapter (not included). Ideal for The Home, Workshop, Hobbyists, Tradesmen, Builders and DIY Enthusiasts, etc. M14 Thread Max 8500RPM