The general-purpose angle grinder backing pads are designed for use with fiber discs. These pads provide superior performance for applications such as grinding, blending, chamfering and surface conditioning. Bosch backing pads fit most major brands of angle grinders. This 4-1/2 In. backing pad has a 5/8 In. to 11 arbor. These backing pads feature sturdy plastic, providing stability allowing minimal vibration and wobble.