RAZOR SHARP 18mm HEAVY-DUTY BLADES - Crafted from Japanese tool steel and double-honed for extreme sharpness, OLFA 18mm Heavy-Duty Ultra-Sharp Black Snap Blades are 25% sharper than standard silver blades to help you work longer uninterrupted. | CONTAINS 10 BLADES / 80 SEGMENTS - You'll receive 10 blades in this refill pack. Each blade contains 8 razor-sharp LBB Heavy-Duty Black Snap-Off segments (80 segments total). Simply snap for a new sharp blade edge. | COMPATIBLE WITH 18mm KNIVES - LB Snap Blades are compatible with most 18mm knives. For best performance, pair OLFA 18mm blades with OLFA 18mm handles. Replacement blade available in quantities of 5 (LB-5B), 10 (LB-10B), 50 (LB-50B) or 100 (LB/CP100). | CUTS A VARIETY OF MATERIALS - These replacement blades provide accurate and reliable cuts on heavy-duty materials like drywall, roofing, flooring, rubber, and more. Great for industrial use, contractors or construction, and other heavyweight jobs. | THE OLFA STANDARD - As the original inventor of the Snap-Off Knife, OLFA has maintained a standard of cutting excellence for our quality and durability. Pairing your OLFA 18mm Utility Knife with OLFA 18mm Blades will provide optimal results.