Thin 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.Optimized tooth design providing 2X more life than our previous generationGrid Iron honeycomb pattern increases blade rigidity to resist blade bucklingTough Neck ribs strengthen the blade tang and minimize breakage