Features and Benefits:?2X Stronger than standard carbon hook blades - replace fewer blades?High quality steel for maximum strength in pull cut applications?Optimized grind angles deliver improved sharpness for less repeat cuts?Ideal for roofing, carpet, Tyvek?, insulation and other building materialsMilwaukee? Hook blades are designed to cut roofing, synthetic wrap, insulation and other building materials. Milwaukee utility blades are engineered to fit Milwaukee and most standard utility knives.