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 electronic beam welded to M42 high speed steel cutting edges for tougher, longer lasting performance. 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.