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 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.