HSS M3 for teeth and alloy steel for body 7 pieces bi-metal holesaw and accessories Size: 22, 25, 29, 32 or 38mm Available in HSS M3 for teeth and alloy steel for body7 pieces bi-metal holesaw and accessoriesSize: 22, 25, 29, 32 or 38mmAvailable in HSS Bi-metal Holesaw Kit with Alloy Steel Body, Available in Blue Plastic Case