... normal abrasives.With feature of good polishing efficiency and long life.1.Metal Bonded Diamond Polishing Blocks Specification: L140,L170 Grit:#12,#16,#24 ... ,#46,#60,#80,#120,#180,#240,#320,#4002.Resin Bonded Diamond Polishing Blocks Specification: L140,L170 Grit:#500,#800,#1500,#3000Any question ,please ...