RockHard Carbide Tipped Bi-Metal Hole Saws feature immense cutting power against abrasive material. The shredding rip guard teeth, built with more steel and finely coated against friction, are carefully designed with the finest edges and sharpened teeth to cut aggressively. These teeth provide incredible cutting efficiency against coarse materials and offer increased productivity on any job, as well as better hole quality. Each also it made from M3 high speed steel and fortified by either carbide grit or tips. RockHard hole saws are premium quality, affordable, and long lasting to provide professionals strong endurance and exceptional results.