This revolutionary PRO-LOAD multi-blade heavy-duty knife easily meets the need for continuous blade change with its automatic blade load feature. Includes auto-lock blade slide, a ratchet blade lock for extra support while cutting through difficult materials, and a blade storage lock for safety. The 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 blades - a new sharp edge with each snap. Accommodates up to 6 blades in the handed for a total of 48 cutting edges per load. Includes 3 blades. Guaranteed Forever.