Bi-metal hole saw with HSS-Co teeth in variable tooth pitch, welded onto a cylindrical tool steel body, the saw core can be easily removed in conjunction with the PUMPSHANK®, for round sawing of steel and non-ferrous metals such as copper, bronze, brass and aluminum, the high-quality cobalt alloy and the special bevel ensure better cutting performance and longer tool life, cool the hole saw with cutting oil when cutting metals, for plastics, plaster and wood materials we recommend the PAROLI 50 carbide hole saw series 2166