Power Change hole saw system has a quick change arbor that quickly removes holesaws from mandrel. Easy plug removal. Bi-metal hole saw cuts material up to 1-5/8" deep. Will cut through a 2x4. Use for cutting in aluminum, brass, bronze, copper, plastic, stainless steel, wood, and other compositions. Includes: Mandrel with pilot bit and hole saw sizes 7/8", 1-1/8", 1-3/8", 1-3/4", 2", and 2-1/2".