Diamond Grinding Blocks: 1.Metal Block:30#,40#,50#,60#,80#,100#,120#,150#,200#,300# 2.Resin Block:400#,600#,800#,1500#,3000 ... # Diamond Grinding Blocks: Be used for automatic continuous polishing ... machine or single head grinding machine.High efficiency and good polishing effect.Metal Block:30#,40#,50#,60#,80#,100 ...