Heavy-Duty Ratchet-Lock Utility Knife (L-1) - Good For: cutting paper, cardboard, roofing, drywall, vinyl, acetates, etc. The original and popular OLFA snap-off cutter. This popular heavy-duty cutter features a contoured handle, a ratchet wheel blade lock and a heavy gauge stainless steel blade channel that holds blade tight. Blades are 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. For right and left handed use. Easy, tool-free blade change for convenience