OLFA Rotary Compass Cutter 186B Effortlessly cut perfect circles from 1-1/2" to 8-3/4" Patented ratchet handle aligns the hand and wrist to help reduce wrist fatigue Handle design creates a "stirring the soup" cutting motion, preventing uncomfortable twisting or strain on the wrist Built-in blade cover and plastic pivot spike guard for safety when not in use Includes and fits the OLFA 18mm rotary blade