Resin segment for grinding disc 1 500# 800# 1500#, segment 2 Welded on grinding wheel 3 Rough Fine grinding segment Resin diamond segment for grinding wheelDiamond & resin diskStrong resistance, glossiness, strong abrasion strength, good definition.Grits:Mental-bonded Discs for rough grinding, 50#, 200#, 400#Resin-bonded Disc: fine and finish grinding/polishing. 500#, 800#, 1500#, 3000# ...