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™ ribs strengthen the blade tang to minimize 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.Sold in packs of 518 Teeth per inch2 Sizes available, 6″ or 9″