Carbide tipped jobber length drill Bi-metal hole saw Material:bearing steel with M3 or M42. Sizes available: metric size14mm-152mm ( inch size 9/16" to 6"). Arbor with Pilot Drill for Hole-Saws 14 - 30mm. Arbor with Pilot Drill for Hole-Saws 32 - 152mm Arbor, pilot drill bits and driving plates, extensions and other accessories can be supplier separately. Hole saw sets on request. T.C.T hole saw available.