... slabs and porcelain tiles in automatic polishing machines Diamond Polishing Blocks are specially used for rough grinding and fine polishing of ... and long life.1.Metal Bonded Diamond Polishing Blocks Specification: L140,L170 Grit:#12,#16,#24,#36,#46,#60,#80,#120,#180 ... ,#240,#320,#4002.Resin Bonded Diamond Polishing Blocks Specification: L140 ...