Introduction of 3x21 inch abrasive belt: The belt is precisely manufactured, and the belt interface is firm and does not break. The abrasive belt is antistatic, washable and the additives in the resin can bear the load, and has good wear resistance and anti-blocking properties. It is suitable for sanding machines and grinders, and has ultimate performance, value, durability and versatility in polishing wood, aluminum, non-ferrous metals, plastics and glass fibers. Specification introduction: Granularity: 80/120/150/240/400. Dimensions: 3x21inch abrasive belt. Abrasive: Alumina Scope of supply: 15 pieces Weight: 560 grams Scope of supply: 2 x grain 80 sand belt 2 x grain 120 sand belt 2 x grain 150 sand belt 2 x grain 240 sand belt 2 x grain 400 sand belt 80# grain: quickly eliminate surface rust spots 150#240grain : eliminate small surface defects 400grain: a smooth surface is quickly polished We provide 5 different abrasive belts, which can satisfy your whole process from rough grinding to fine grinding. Can deal with all your daily polishing needs.