Hub contact surface cleaning tool. which can be used with a 1/2" cordless or compressed air tool. Used to clean hub contact surfaces. to prevent wheel vibration at higher speeds. Thanks to the special composition of the cleaning fibers. no sparks are generated during cleaning. Approximately 50 vehicles (approx. 200 hubs) can be cleaned with one disc. Max. speed 4000 rpm. Diameter 150 mm. 2 cleaning discs in a box.