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 breakage?Matrix II bi-metal teeth for greater durability?Grid Iron? honeycomb pattern increases blade rigidity to resist blade buckling?Thin kerf bladesThin 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.