The 7-1/4" 45T Carbide-Tipped Max Efficiency Saw Blade, Metal/General Purpose is for use with the 7-1/4" Metal Cutting Saw (4131). The 7-1/4" 45T Carbide-Tipped Max Efficiency Saw Blade is engineered with high grade Tungsten Carbide tips for durability and can cut pipe, angle iron, channel, and more. The E-12815 allows for up to 80% faster cutting than standard blades. It is a fully hardened and expertly hand-tensioned steel saw plates for true cuts. The ultra-thin 0.055" kerf reduces the load put on the tool.