Lenox Gold 20350, Bi-Metal Utility Knife Blade, 5 Pack *Lasts Longer *Shatter resistant *Makes deeper cuts *Cuts the toughest materials *Fits in all standard utility knives Blades have a high speed steel edge with titanium coating that keep the blades cutting after others have quit. The patented bi-metal construction allows the blades to bend and flex without breaking. The four notch system allows the blade to extend further. The LENOX Gold Titanium Edge Utility Blades fit all standard utility knives and are great for cutting drywall, insulation, flooring, roofing and more.