Material: Polyurethane Spare wheel disc: Approximately 2" / 50mm in diameter Drill shank: approx. 1/4" / 6.35mm Foam padding: approximately 1/2" / 13mm in diameter Thickness Color: Yellow, Black What You Get: 5 foam pads, 5 back pads 50mm, 5 drill adapters. Check dimensions: The dimensions of the wheel change pads are approx. 2"/50mm diameter, about 2"/50mm shank drill. 1/4" / 6.35mm, foam padding is approx. 1/2" / 13mm thick; please check the dimensions before purchasing Reliable material: the sanding pad is made of polyurethane, which has good durability and flexibility, reliable in use and not easy to break, which can minimize the transfer of heat and increase tool life. Soft Sponge: Made of soft and durable sponge for uneven polishing. Prevents damage to backing pads and increases disc support for better abrasive cuts and edge sanding. Applicable items: Our replacement pads for standard grinding wheels can be used with grinders, pneumatic grinders, electric drills, etc., and can withstand operating speeds of up to 10,000 rpm, suitable for most rotary tools.