Made from a high-quality Japanese grade carbon tool steel. The Olfa black blades are double-honed for extreme sharpness and are 25% sharper than the Olfa silver heavy-duty HB blades. SKU: 42860495 MFG: 9061 Shop more products by Olfa. We offer wide selection of Hammers & Striking Cutting And Shaping Tools, with Life and Home you always get the best deals SHARE Share on Facebook Tweet on Twitter Share on Google+ Pin on Pinterest Shipping not available to CA Free shipping over $35 Sold out $21.79 Quantity Sold Out Sold out Request a Bulk Quote Thank you for your quote request. We will be in touch. DETAILS Description DESCRIPTION Highlights: 20 per pack Type: snap off Blade size: 25 mm Extra heavy duty, snap off blade made from high quality carbon tool steel for sharpness and edge retention 7 cutting edges per blade; cuts drywall, roofing, linoleum, carpet, sod, insulation board and more Blades for knife H-1, XH-1 (SKU #'s 252.9519 and 692.1118 FEATURES MFR: 9061 SKU: 42860495 UPC: 091511600315 Brand: Olfa