Milwaukee 2-Ended Hook 1-7/8 In. Utility Knife Blade (50-Pack)Hook blades are designed to cut roofing, synthetic wrap, insulation, carpet and other building materials. 2 times stronger than standard carbon hook blades. High quality steel for maximum strength in pull cut applications. Optimized geometry delivers more pull force than competitive hook blades. Engineered to fit Milwaukee and most standard utility knives.