Detailed Product Description 1-Abrasives grains: Aluminium Oxide,Silicon Carbide,2-Grains grit: 120,150,180,240,320,400,8003-Bonding:Resin 4-Version type:Flat type5-Size:1.5",2",2.5",3"(40,50,62,75mm)6-Screw nut size:8mm7-Backing:re-enforced non-woven clothing