This carbide tipped hole saw has greater wear resistance and higher heat resistance than the bi-metal hole saws. The carbide tipped tooth design features triple chip grind for smoother, concentric cuts. This saw has up to 10 times longer life on abrasive material than standard bi-metal hole saws. It has a cutting depth of 1 1/2" (38mm). The Arbor, carbide tipped pilot, and extension is sold separately.