IF IT'S PRECISION YOU WANT CHOOSE THESE OLFA SNAP-OFF BLADES. THEY ARE EXTREMELY SHARP TO BEGIN WITH AND YOU CAN SNAP OFF A DULLED EDGE TO MAINTAIN CUTTING PRECISION. USE THESE BLADES FOR CONSTRUCTION MATERIALS INCLUDING DRYWALL LINOLEUM CARPET FLOORING INSULATION AND ROOFING MATERIALS. 8-SEGMENT 18MM SNAP-OFF BLADE. MADE FROM HIGH-QUALITY CARBON TOOL STEEL. DOUBLE-HONED BLADE PROVIDES SUPERIOR INITIAL SHARPNESS AND EDGE RETENTION. EXACT 59 DEGREE EDGE ANGLE OPTIMIZES CUTTING POWER AND MINIMIZES BLADE BREAKAGE. PACKAGE QUANTITY 10. MUST BE 18 YEARS OR OLDER TO PURCHASE THIS PRODUCT.