Stanley Heavy-Duty Roofing Utility Knife Blade is designed to cut roofing shingles, felt paper, and similar heavy building materials with ease and precision. This blade features increased material thickness, making it 75% stronger than Stanley's standard hook blade, ensuring durability and strength for today's heavier and thicker roofing materials. The edge is engineered to withstand the demanding rigors of cutting tough roofing materials, providing reliable performance on the job. With a blade length of 1-7/8 inches and a two-ended hook design, it versatility and convenience. Made from carbon steel and packaged in sets of five, this utility knife blade is a dependable choice for roofing professionals and DIY enthusiasts alike. Model Number: 11-939