About this item. Practical Sanding Discs Set - Comes with 300pcs sanding discs in 10 grits, 30pcs for each grit: 80/100/180/240/600/800/1000/1200/2000/3000; 1pc 1/4 shank holder 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 Pad - The sanding discs set includes 1pc soft foam pad, perfect for reducing vibration during use. Before use, make sure the soft foam pad is securely attached to the sanding discs and backing pad. Hook and Loop Fastener: The diameter of the hooks and rings on the backing pad is 50mm, which is suitable for most rotary tools, such as sanders, air sanders, electric drills, etc. Important Note: These sanding pads are compatible with 50mm backing pads, not self-adhesive backing pads. Please clean the dust and replace the old backing pad before use. More information