Bosch Hsbim9 9-Piece Bi-Metal Hole Saws Assorted Kit With, Plastic Materials The Bosch 9 pc. General Purpose Bi-Metal Hole Saw Kit is designed for users who are looking for convenient way to get clean fast cuts in such materials as wood, aluminum, metal and plastic. The kit comes with six hole saw sizes: 3/4 In., 7/8 In., 1-1/8 In., 1-1/2 In., 1-3/4 In. and 2 In. The universal arbor fits all brands and sizes to simplify diameter changes, facilitates faster plug removal and enables tool-free accessory install. It?s made to let you change hole saws in seconds. The pilot bit is designed for a variety of materials as well. The hole saws feature the Progressor tooth design, which features alternating teeth size for performance, cutting faster and lasting longer in wood, aluminum, metal and plastic materials. The 2-in-1 cuts are clean and fast. Large teeth are optimized for fast cuts in thick materials; small teeth are optimized for clean cuts in thin material. The hole saws are made with 8% cobalt alloy and are designed with reinforced shoulders. All-in-one kit ? features two SpinLOCK Universal arbors, steel pilot bit and six hole saws with Progressor tooth design SpinLOCK universal arbor ? fits all brands and sizes to simplify diameter changes with fast plug removal and tool-free install The pilot bit ? designed to start holes in a variety of materials Progressor tooth design ? hole saws feature alternating teeth size for performance, cutting faster and lasting longer in wood, metal and plastic materials Durable hole saw material ? hole saws are made with 8% cobalt alloy