CRL Heavy-Duty Hook-End Blades fit all standard, heavy-duty, and retractable blade utility knife handles. When removing encapsulated windshields, this blade is perfect for cutting away the encapsulation. Blades are double end configuration, and the short length of exposed blade works to minimize twisting of the blade when heavier pressure is applied for cutting thicker plastic. Standard utility knife blades can scratch the pinchweld leading to rust development. Available in the popular 10 blade pack or the shop size 100 blade, bulk box.