Hot taping the DM3MECH Mechanical Hot Tapping Machine. With the right hole saw, cut or drill into copper, steel, or plastic pipe for up to 4in valves. DM3MECH contains the base machine, along with 7/16in Hex Arbor, 1/4in Drill Bit, Hole Saws 5/8in, 7/8in, 1 1/8in, 1 3/8in, 1 3/4in, 2 1/4in, 3 1/4in, Allen wrenches and toolbox.