【Grits】-Including the most commonly used grits: 2 X 40/60/80/120/180/240/320/400 grits, total 16pcs 75 x 533 sanding belt. 【Material】- The sanding belts are made of durable open-coat aluminum oxide grains and fully resin bonded, quality craftsmanship allows even sand grain, providing fast and durable sanding. 【Connection】 - Precision designed two-way belt joint, diagonal connection eliminates splicing bump, the belt sander belt interface is flat, firm and not easy to break under pressure. 【Application】 - Suitable for 533X75mm(21X3inch) belt sander - providing coarse to fine sanding, stripping and sanding for wood, aluminum, fiberglass, rubber, plastic, stone and non-ferrous metals ect. 【More Grits】-Very complete grit size from coarse to fine 40/60/80/120/180/240/320/400, meet all of your sanding work. Different grits are recommended: 40 - 60 Grit: Heavy sanding and stripping 80 - 180 Grit: Removing small imperfections 240 - 400 Grit: For a smooth, super-fine finish Package includes: 2