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. Ice Hardened Blades Are Cryogenically Treated For Up To 50% Longer Life. These Blades Are Ideal For Making Tough, Straight Cuts.