DAMO 3/8 inch Bevel Diamond Hand Profiler Router Bit Profile Wheel with 5/8-11 Thread for Granite Concrete Marble Countertop Edge For 3/8" bevel(45 degree) edge; Fits on polishers/ grinders with 5/8"-11 thread spindle; The nylon guide assure the profiled edge remains straight; Utilizing vacuum brazed diamond technology; Wet or dry application, optimal speed 3,500- 4,000 RPM.