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 and the 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.