Belt Grinder Contact Wheel Belt Sander Rubber Contact Wheels Contact Wheel Serrated Rubber 10" Belt Grinder Contact Wheel Serrated Rubber Dynamically Balanced Ready to mount in no time No Need for a special adapter heavy duty bearings installed (2 x 25 mm Bearing 6205 RS) A steel sleeve is mounted, and its bore is 1/2 inch. This is a top-quality product.