Our Ergo Control Rotary Cutter features a unique blade design gives both right- and left-handed users excellent blade visibility. It includes a smooth-rolling 60mm rotary blade that extends when the handle is squeezed and automatically retracts for safety when the handle is released, plus a thumb lock lets you secure the blade in the open or closed position for convenience. An ergonomically sculpted handle fits your hand comfortably, and a longer handle design than other rotary cutters offers improved control. Replacement 60mm rotary blades available item 01-005895. Five-pack of replacement 45 mm rotary blades available item 01004013J. Lifetime warranty.