product description: size:16" 406mm material: fibre , silicon carbide or aluminum oxide grit:36 40 60 80 100 120 150 180 220 240 320 400 600 800 application:used for rust cleaning , grinding and polishing the surface of metal and non-metal. characteristic:not only used for granding wall ,cleaning plaster board ,also used for remove rust ,grinding and polishing the surface of metal and non-metal . used for inteasted of abrasive cloth and sand paper.