About this item Sanding discs 3 inch 120 pcs per box, included 80/100/120/180/240/320/400/600/800/1000/2000/3000 each grit 20pcs, sanding pad and 2 shanks. Sanding pads with 1/4" Round and Hex shank can use with air or electric drill, die grinder and other rotary tools for the utmost sanding control. Re-print the clear particle grit on the back of the 75mm sanding discs, it is more convenient when choosing to use. Sandpaper made of aluminium oxide. 3000Grit sanding discs can dry or wet polishing. Widely used in the grinding and polishing of metal and non-metal, wood, rubber, leather, plastic, stone, glass.