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.