This plumber's heavy duty hole saw kit features a range of accessories and variable pitch bi-metal hole saws, suitable for cutting steel, brass, bronze, cast iron, aluminium, wood and plastics. Manufactured from high-quality steel with a M3 steel cutting edge for fast clean cutting action, with a maximum cutting depth of 35mm. Each hole saw has four side vents for the efficient removal of waste and features two connection threads for fixing to an arbor. Supplied inside a sturdy blow moulded storage case.