OLFA 18mm snap knife blades. The best choice of replacement blades for your OLFA utility knife or cutter. Made of high-quality carbon tool steel with a double-honed blade for unparalleled sharpness and superior edge retention. Exact 59 degree edge angle optimizes cutting power and minimizes blade breakage. Fits 18mm OLFA utility knives. 8 snap-offs per blade. Double-honed to 11 degrees for sharpness. Use these blades for construction materials including drywall, linoleum, carpet, flooring, insulation, roofing materials. PACK OF 5 blades (40 snap-offs total).