What you get: 5 x foam pads, 5 x 50mm back pads, 5 x drill adapters. Check the dimensions: The dimensions of the wheel changing pads are approx. 2" or 50mm diameter, shank drill about 2" or 50mm. 1 or 4" or 6.35mm, foam padding is approx. 1 or 2" or 13mm thick please check the dimensions before purchasing Reliable material: The sanding pad is made of polyurethane, which has good durability and flexibility, reliable use and not easy to break, which can minimize the transfer of heat and improve tool life. Soft sponge: Made of soft, durable sponge for uneven polishing. Prevents damage to backing pads and increases disc support for better abrasive cuts and edge sanding. Applicable objects: Our replacement pads for standard grinding wheels can be used with grinders, grinders, Pneumatic grinders, electric drills, etc., can withstand operating speeds of up to 10,000 rpm and are suitable for most rotary tools. Good quality product