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. Ice Hardened blades are cryogenically treated for up to 50% longer life. Maintaining a short profile and thin body, these blades are ideal for making fast, flexible cuts.