The Torch� metal-cutting blades with the Double Duty Upgrade� feature a tooth form optimized for the longest life and maximum durability. Tough Neck� is engineered to protect against tang breakage and delivers the strongest SAWZALL� blade tang on the market. Grid 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. These blades are ideal for making tough, straight cuts.