OLFA 18mm Ultra-Sharp Black Snap-Off Blades — Japanese Carbon Steel

OLFA 18mm black snap-off blades are the refill the trades reach for when the silver blade stops earning its keep — ultra-sharp replacement blades honed twice over from Japanese carbon tool steel, each carrying eight scored segments that snap clean to a fresh 59-degree edge. The double-honed black finish isn't cosmetic: it marks an edge up to 25% sharper than a standard silver snap blade, the difference between dragging through roofing membrane and drawing a single deliberate line through it. Drywall, underlay, vinyl flooring, insulation, shingle — the 0.5mm blade holds its line through the materials that dull lesser steel by lunch. Each blade measures 100mm by 18mm and fits most 18mm snap-off utility knives, OLFA handles included, so the pack drops straight into the knife already on the belt. Available in ten- and fifty-blade dispenser packs, each blade carrying eight fresh edges: buy once, snap fresh, keep cutting.