Cut precise holes in wood, plastic, aluminum, brass, steel alloys and even stainless steel with this bi-metal hole saw set. The set is constructed with alloy steel bodies that are electronic beam welded to M3 high speed steel cutting edges for tougher, longer lasting teeth. Features include variable teeth for less vibration, a durable enamel finish that won’t rust or corrode and a heavy duty solid backing plate that won't flex to ensure accurate holes every time.