The maximum sharpness / Made in Japan /OLFA 18mm Stainless Steel Ratchet-Lock Heavy-Duty Utility Knife & 18mm Snap-Off Heavy-Duty Silver Blade, 10-Pack Value Set (with our shop original description of goods) Professional strength stainless steel blade channel secures blade for the toughest of cutting jobs Blade is made of high-quality Japanese grade carbon steel and designed for unparalleled sharpness and superior edge retention Long lasting and durable - a new sharp edge with just a snap Easy, tool-free blade change & Great for cutting paper, cardboard, roofing, drywall, vinyl, acetates, etc The discount set which adjusted a main unit and 10 replacement blades