The Milwaukee 9 in. x 10 TPI Torch metal-cutting blades with the Double Duty Upgrade feature a tooth form optimized for the longest life and maximum durability. The tough neck is engineered to protect against tang breakage and delivers the strongest SAWZALL blade tang on the market. The grin iron features a stamped honeycomb pattern throughout the body of the blade that greatly increases the rigidity of the blade, making it the stiffest metal cutting SAWZALL blade on the market. Ideal for making tough, straight cuts, these ice-hardened blades are cryogenically treated for up to 50% longer life.