【What You Get】5pcs Foam Backing Pads, 5pcs 50mm Backing Pads, 5pcs Drill Adapters. 【Check the Size】The sanding disc replacement pad measures approx. 2 inch/ 50 mm in diameter, the shank drill bit measures approx. 1/4 inch/ 6.35 mm, the foam buffer pad measures approx. 1/2 inch/ 13 mm in thickness; Please check the size before purchase 【Reliable Material】The sanding pad is made of polyurethane, with good durability and flexibility, reliable to use and not easy to break, it works to minimize heat transfer and increase tool life 【Soft Foam】Made of soft and durable sponge, suitable for uneven polishing. Protects against damage to the backing pad and adds support to the disc for better abrasive cutting and edge sanding. 【Applicable Objects】Our replacement pads for standard sanding discs can work with die grinder, air grinder, electric drill and more, can withstand a maximum operating speed of 10000 rpm, applicable to most rotary tools