Olfa 60mm Ergonomic Rotary CutterFeatures dual action safety lock that locks the blade open for comfort and closed for safety. For both right and left handed users with an ergonomic handle design. Cutter is especially useful for heavy fabrics and easily cuts through denim and mesh netting. Uses replacement blades RB60 1 and RB60 5. OLFA's Deluxe Ergonomic 60mm Rotary Cutter is designed to reduce hand and wrist fatigue. Squeeze handle to expose blade for cutting. Blade self retracts