Fiskars Ergo Control Rotary Cutter features a unique blade design gives both right- and left-handed users excellent blade visibility. It includes a smooth-rolling, premium steel 45 mm 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.