Features and Benefits:�Optimized tooth design providing 2X more life than our previous generation SAWZALL® blades Tough Neck™ ribs strengthen the blade tang and minimize breakageThin Kerf metal-cutting blades with the Double Duty Upgrade™ feature a tooth form that is optimized for the longest life and increased speed. Tough Neck™ is engineered to protect against tang breakage and delivers the strongest SAWZALL® blade tang on the market. Maintaining a short profile and thin body, these blades are ideal for making fast, flexible cuts.