Bi-metal hole saw with HSS-Co teeth, variable tooth pitch, weld on a cylindrical tool head of steel. Fast and easy remove of the saw core by using the PUMPSHANK® ejector. Round sawing in steel and nonferrous metal as copper, bronze and aluminium with box column drill or power drill. Due to the high quality cobalt alloy and the special polished section, you receive a better cutting performance and a longer service life. We recommend to cool the hole saw with cutting oil when carving metal. For plastics, plaster and derived timber products, we recommend the PAROLI All-Round 50 TCT universal hole saw, product line 2166.