Dewalt, 75 Piece, Heavy Duty Utility Blade, Grinding Geometry Offers An Edge That Is 35 Percent Sharper, Faster More Accurate Cuts From The Start Of Work, Specially Heat Treated Blades That Are 20 Percent Stronger For Durability & Requires Less Blade Changes, Induction-Hardened Cutting Edge Provides 75 Percent Longer Cutting Life.