HSS Bi-metal holesaw - Incorporating a special fracture-proof design and hardened super-speed steel teeth with vari-pitch for rapid drilling progress. These holesaws are for use in stationary and hand held drilling machines to produce clean circular holes in cast iron, steel, copper, bronze, aluminium, plastics, plasterboard and wood. For longer life use a high quality cutting oil when sawing metals (except cast iron). All sizes cut to a maximum depth of 32mm. Use AS1 or AS3 arbours for 14 - 30mm dia. and AS2 or AS4 arbours for 32 - 152mm dia..
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