Utility blades. Edge in engineered to easily cut abrasive drywall material. Double hardened blade edge for increased cutting life. 100 percent longer life on average compared to Stanley 11-921 Heavy Duty Blade resulting in far fewer blade changes. Cuts and scores drywall ceiling tile wallboard and similar materials. Drywall callout is laser etched on blade to prevent mixing with standard blades. 50 per card.