What you get: 5 x foam pads, 5 x 50mm back pads, 5 x drill adapters. Check the size: the sanding disc replacement pad measures approx. 2 inch/ 50 mm in diameter, shank drill bit measures approx. 1/4 inch/ 6.35 mm, the foam buffer pad measures approx. 1/2 inch/ 13 mm thick; please check the size before purchasing. Reliable material: the sanding pad is made of polyurethane, durable and flexible, reliable to use and not easy to break. It minimizes heat transfer and increases the service life of the tool. Soft foam: made of soft and durable sponge, suitable for uneven polishing. Protects against damage to the backing pad and provides additional grip of the wheel for better cutting and edge grinding. Applicable objects: Our replacement pads for standard grinding wheels can be used with the grinder, pneumatic grinder, electric drill, etc. In addition, it can withstand a maximum operating speed of 10,000 rpm and is suitable for most rotary tools.