DAMO Z30 90 Degree Diamond Hand Profiler Drum Wheel with 5/8-11 Thread for Granite Concrete Marble Countertop For 1-1/4" thickness (granite) and below; Quickly remove stock and smooth out rough edges of sink hole cut outs; Fits on polishers/ grinders with 5/8"-11 thread spindle; The nylon guide assure the profiled edge remains straight; Wet or dry application, optimal speed 3,500- 4,000 RPM.