Heavy-duty, snap-off blade ideal for construction and industrial applications. This blade is made from high-quality carbon tool steel and is produced using the OLFA 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. This 18mm blade fits most OLFA Heavy-Duty LB Utility Knives. 8 cutting edges per blade. 5 blades in each package.