LASTS LONGERHigh speed steel edge with titanium coating keeps blades cutting after others have quitSHATTERPROOFPatented bi-metal construction allows blades to bend and flex without breakingMAKES DEEPER CUTSFour notch design allows blade to extend furtherCUTS THE TOUGHEST MATERIALS Great for cutting drywall, insulation, flooring, roofing and moreFITS ALL STANDARD UTILITY KNIVES