Tungsten carbide-tipped hole saw with a body made of heat-treated steel, M16 internal thread for shaft attachment, suitable for cutting drywall, aerated concrete, Heraklith, plastics, particle board, plywood, must be used without impact, with the hole edge cutter you can countersink the collar of a hollow wall box to match 2160.068, not compatible with ejector shaft PUMPSHANK®, please order adapter shafts and centering drills separately.