3/16" Demi-bullnose/Roundover Diamond Hand Profiler/Router Bits with 5/8-11 Thread for Countertops 1 Piece of Diamond Brazed 3/16" (5mm) B5 Router Bit / Profile Wheel. Fits on polishers/ grinders with 5/8"-11 standard thread spindle. nylon guide ensure the profiled edge straight. Wet or dry use, with water feed hole. ideal speed 3,500- 4,000 RPM.