Used to clean wheel and brake disc hubs. Aluminum cleaning pad holder with 8-point profile. No spark, cup-shaped, open-pored abrasive material cleaning pads reduce dust formation. Hook and loop attachment of cleaning pads. Designed for use with power drill. Wear resistance: approximately 50 vehicles per pad. Contains: (Qty.) (1) Aluminum Cleaning Pad Holder, (5) 40 mm Cleaning Pads, (6) 50 mm Cleaning Pads. For replacement cleaning pads, see part # 4960N-40/5 for 40 mm and 4960N-50/5 for 50 mm.