160mm diameter For the optimal cleaning of the inner wheel contact surface Prevents corrosion related distortion of wheel bolt tightening torque Completely removes burnt in corrosion To be used only on the inside of an aluminium rim, particularly the inner area prior to wheel balancing The pourous abrasives and cup shaped grinding plate ensures minimal dust Discs are attached with velcro, making them easy to replace Optimized for the latest wheel rims with an internal diameter of 75mm