... slabs and porcelain tiles in automatic polishing machines Diamond Polishing Blocks are specially used for rough grinding and fine polishing ... polishing efficiency and long life.1.Metal Bonded Diamond Polishing Blocks Specification: L140,L170 Grit:#12,#16,#24,#36,#46,# ... ,#80,#120,#180,#240,#320,#4002.Resin Bonded Diamond Polishing Blocks Specification: L140,L170 Grit:#500,#800,#1500,#3000Any question ...