FeaturesOptimized tooth design providing 2X more life than our previous generation SAWZALL® blades Tough Neck™ ribs strengthen the blade tang and minimize breakage Grid Iron™ honeycomb pattern increases blade rigidity to resist blade bucklingSAWZALL® blades Tough Neck™ ribs strengthen the blade tang and minimize breakage Ice Hardened™ for up to 50% longer lifeThin kerf metal cutting blades with the double duty Upgrade™ feature a tooth form that is optimized for the longest life and increased speedDouble relief angle reduces tooth stress for long lifePrecision forming process creates sharper teeth for fast cuttingMatrix II Bi-metal teeth for greater durability