Irwin Bi-Metal Holesaw Kits are available in a unique attractive soft storage case that incorporates an unbreakable hinge and internal padding that protects its contents. The case has an integral handle and has a cardboard sleeve that contains important product information. The Bi-Metal holesaws cut through a variety of materials, including aluminium, copper, iron, stainless steel, wood and zinc. They have precision set teeth for faster penetration and the electron beam weld ensures stronger, longer lasting teeth. The Bi-Metal construction makes these holesaws tough and durable. This 17 piece set consists of the following:12 x Holesaws: 16, 19, 22, 25, 29, 32, 35, 38, 44, 51, 64 and 76mm.1 x 9.5mm Mandrel for holesaws 14 to 30mm.1 x 13mm Mandrel for holesaws 32 to 210mm.3 x Pilot Drills.