This knife is larger than other standard duty cutters, providing more leverage for tougher cutting projects. Features a positive slide lock, a ratchet wheel blade locking mechanism to hold blade in place and a stainless steel blade channel that holds a blade tight. Blades made from high quality carbon tool steel are produced using OLFA's precise multi-step production process for unparalleled sharpness and superior edge retention. Long lasting durable snap-off blade - a new sharp edge with each snap. Guaranteed Forever.