Lenox Gold Utility Knife Blades 5 Pack (20350-GOLD5C) have high-speed steel edges with titanium coating for a longer blade life. The shatterproof, bi-metal construction allows the blades to bend and flex without breaking, making it easier to cut through tough materials like dry wall, insulation, flooring and roofing. Make deep cuts by extending the utility blade up to 4 notches beyond the handle. The bi-metal blades fit most standard utility knives.