THE PRECISION GRINDING OF THE CUTTING BEVEL ANGLES AND THE IMPROVED HONING ON CUTTING EDGE ANGLES MAKE THIS BLADE - UP TO +35 SHARPER. SPECIALLY HEAT-TREATED FOR A MORE FLEXIBLE BLADE - UP TO +20 STRONGER. INDUCTION HARDENED EDGE - UP TO +75 LONGER CUTTING LIFE. VERSATILE CUTTING APPLICATIONS - DRYWALL CARPET ROOFING FELT HOUSE WRAP TAR PAPER INSULATION. BASED ON AVERAGE VALUES COMPARED WITH STANLEY 1992 BLADES. VERSATILE CUTTING CUTS DRYWALL CARPET ROOFING FELT TYVEK INSULATION AND SIMILAR MATERIALS.