PLG2SUPT 4-1/4” HSS Bi Metal Hole Saw Cutter for Wood Drywall Plastic Aluminum Mild Steel Iron Metal Stainless Steel Heavy Duty Hole Saw Bit with Arbor - MKC, HS1-108

• Package: 1 of 4-1/4” hole saw bit (red or black), 1 of mandrel for 1/2” chuck, 1 of silver HSS pilot drill bit for wood, soft metal. 1 of black HSS pilot drill bit for hard metal. 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” (38 mm) Durability and Quality: Bi-metal strip is made by laser welding machine and vacuum heat treatment, providing better hardness, strength, and longer life.