Application: Quick and easy removal of rust and dirt from the contact surfaces of wheel hubs and brake discs with support for the wheel bolts. Prevents the falsification of the tightening torque of the wheel bolts caused by corrosion. Suitable for wheel hubs of passenger cars with a diameter of up to 160 mm and an inner diameter of 75 mm. The maximum speed is 500 RPM. This 2-piece set includes 1 base component and 1 grinding disc with a diameter of 160 mm. It features a 12.5 mm (1/2 inch) square drive for connection to pneumatic, battery-operated, and corded impact wrenches. The wear-resistant design lasts for approximately 100 vehicles per wheel. The open-pore grinding material and the cup-shaped grinding disc minimize dust generation, and no sparks are produced. The grinding plate can be applied quickly and securely due to its serration and hook-and-loop design. Number of tools: 2.