Features: * Use for heavy duty cutting in stainless and mild steel, cast iron, copper, brass, aluminum, plastics, wood, and composition board * Reinforced to cut stronger, last longer, and resist tooth strippage * High speed steel teeth resist breaking and offer extended life * Thick backing plate with holes for drive pins resists damage due to high torque * M2 high speed steel cutting edge welded to a shatter resistant spring steel back * Cuts up to 1-5/8 inch deep * 4/6 vari tooth design for aggressive cutting action and reduced vibration * 3/16-inch thick heavy duty backing plate is more durable than stamped backing cups and eliminates need for torque driving plate What"s In The Box: * Lenox 1772121 6-Inch Bi-Metal Hole Saw