F30(1-1/4") Ogee Diamond Hand Profiler / Router Bits with 5/8-11 Thread for Countertops For 30mm(1 1/4", 1 1/4 Inch) Thickness Bullnose (Ogee). 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.