Stanley 11-939 Roofing Asb Utility Blades,5 per Pack Edge is engineered to withstand the rigors of cutting today's heavier and thicker roofingmaterials 75-percent stronger than Stanley 11-983 Hook Blade, resulting in fewer blade changes Cuts roofing shingles, felt paper, Tyvek, foam board, insulation, shingles and other buildingmaterials ROOF callout is laser etched on blade to preventaccidental mixing with standard blades Designed for use in fixed blade knives only Edge is engineered to withstand the rigors of cutting today's heavier and thicker roofing materials 75% stronger than Stanley's 11-983 Hook Blade resulting in fewer blade changes Cuts roofing shingles, felt paper, Tyvek, foam board, insulation, shingles and other building materials Designed for use in fixed blade knives only. ROOF callout is laser etched on blade to prevent accidental mixing with standard blades Limited Lifetime Warranty