HOT ITEM FOR MODERN QUILTERS! - The ground-breaking patented ratchet mechanism of the rotary circle cutter easily and efficiently cuts clean, multiple layers of perfect circles from 1 7/8" to 8 1/2" every time. It is designed for both right and left-handed use and reduces wrist fatigue connected with 'Yo-Yos', Cathedral Windows, Drunkard's Path, etc. Includes a built-in blade cover for safety, and a plastic guard to cover the pivot spike when not in use. Uses RB18 (standard) replacement blades. OLFA® 18mm Circle Rotary Cutter.