Quantity & Practical Set - Package includes 200pcs sanding disc pads, 10 grits, 20pcs for each grit: 80/180/240/320/400/600/800/1000/2000/3000; 1pc 1/4 inch shank holder pad and 1pc soft foam pad, large quantity to meet your different polishing needs. High Quality Material - Made of aluminum oxide abrasive, durable and anti-static, useful for cleaning and polishing corners such as polished metal, wood, jade, etc. Soft Foam Buffer Pad - The sanding disc set includes 1pc soft foam buffer pad, great for reducing shock during use. Please make sure the soft foam buffer pad is properly connected to the sanding discs and backing pad. Hook and Back Loop - The diameter of the loop sanding pad is 50mm, suitable for most rotary tools, such as die grinders, air grinders, electric drills, etc. Important Note: These sanding disc pads fit 50mm backing pad, they are not suitable for self-adhesive sanding pad. Please clean the dust and replace the old sanding pad before using it