... wheel 3 Rough Fine grinding segment Resin diamond segment for grinding wheelDiamond & resin diskStrong resistance, glossiness, strong abrasion ... for rough grinding, 50#, 200#, 400#Resin-bonded Disc: fine and finish grinding/polishing. 500#, 800#, 1500#, 3000# ... #,800#,1500#,3000#Shape, good durability, nice polishing effectionPolishing disc(black,white)smooth polish, glazing fast, ...