Office Supplies › Olfa Heavy-Duty Utility Knife Blade - 0.71" (18 mm) Thickness - Straight Style - Snap-off - Carbon Steel - 50 / Pack Image 1 of 1 Olfa Heavy-Duty Utility Knife Blade - 0.71" (18 mm) Thickness - Straight Style - Snap-off - Carbon Steel - 50 / Pack $38.89 Quantity: Add To Cart Added! Replacement heavy-duty blades are designed for use with the Olfa L1 Heavy-Duty Cutter. Blades feature eight snap-off sections. SKU: OLF5016 Replacement heavy-duty blades are designed for use with the Olfa L1 Heavy-Duty Cutter. Blades feature eight snap-off sections. SKU: OLF5016