OLFA 5003 L-1 18mm Ratchet-Lock Heavy-Duty Utility Knife Value Set of 3 (With Our Shop Original Product Description) Professional strength stainless steel blade channel secures blade for the toughest of cutting jobs Great for cutting paper, cardboard, roofing, drywall, vinyl, acetates, etc Blade is made of high-quality Japanese grade carbon steel and designed for unparalleled sharpness and superior edge retention. The profitable set packed three Long lasting and durable - a new sharp edge with just a snap.& Long lasting and durable - a new sharp edge with just a snap.