... grinding head: For concrete polishing & grinding Dry and wet use Size: 3" - 10" Factory directed price Diamond tool - diamond concrete grinding head is made ... to the best of our ability. Item No.:diamond grinding head Diameter:3", 4", 5".Grit: #50, #100, #200, #400, #800 ... .Feature1. For concrete polishing & grinding.2. Total Coverage about 40,000 - 60,000SQ.Ft. Given 12 discs per cut, this is only ...