5/8 To 2, 2-1/2? Hss Bi Metal Hole Saw Kit For Wood Drywall Plastic Aluminum Package: 9pcs hole saw drill bits, 1 of 5/8,25/32,7/8,1,1-1/4,1-5/16,1-9/16,2,2-1/2, 2 of mandrels for 3/8? chuck, 1 of black HSS pilot drill bit for hard metal. 1 PP box. Application: Ideal for Wood, Plasterboard, PVC, MDF, Drywall, Aluminum. Can cuts thin metal. Not only for wood. It's Real bi-metal hole saw. It?s much better for cutting soft material. Long Life: Can drill 30 holes (up to) in 0.12" low carbon steel plate. Be careful: Lower the SPEED at the beginning, otherwise, it is easy to break teeth. Max cutting depth: Up to 1-1/2? (38mm) Durability Quality: Bi-metal strip is made by laser welding machine and vacuum heat treatment, providing better hardness, strength, and longer life.