FOR CUTTING JOBS THAT REQUIRE SUPERIOR SHARPNESS CHOOSE THESE OLFA ULTRASHARP BLADES. THESE CARBON TOOL STEEL BLADES ARE DOUBLE-HONED FOR EXTREME SHARPNESS. USE THESE BLADES FOR CONSTRUCTION MATERIALS INCLUDING DRYWALL LINOLEUM CARPET FLOORING INSULATION AND ROOFING MATERIALS. 8-SEGMENT 18MM SNAP-OFF BLADE. FITS OLFA PRO 18MM UTILITY KNIVES. MADE FROM HIGH-QUALITY CARBON TOOL STEEL. ULTRA-SHARP BLACK BLADE HAS A 25 SHARPER EDGE FOR LESS CUTTING RESISTANCE. EXACT 59 DEGREE EDGE ANGLE OPTIMIZES CUTTING POWER AND MINIMIZES BLADE BREAKAGE. PACKAGE QUANTITY 50. MUST BE 18 YEARS OR OLDER TO PURCHASE THIS PRODUCT.