With the Bahco 3830-133-VIP Sandflex bi-metal hole saw, you can cut clean, accurate 133 mm holes with ease. Its bi-metal build featuring 8% cobalt delivers superior wear resistance when sawing through wood, plastic, ferrous and non-ferrous metals, and stainless steel. This makes it an ideal solution for installing ventilation ducts, pipe pass-throughs, and electrical conduit. Featuring a maximum cutting depth of 38 mm (1 1/2 inch) and practical lateral knockout slots for quick core removal, it keeps your workflow fast, precise, and productive.