Features & Benefits 4" or longer for pass through shank arbors HSS tipped pilot bits are for bi-metal hole saws Carbide tipped pilot bits are for the carbide grit or carbide tipped hole saws Pilot bits have a 1/4" shank

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The perfect addition to your plumBOSS Built-In Arbor Hole Saw collection. This Extension Arbor fits all our Hole Saws, extending their reach and helping you drill holes in hard-to-reach places.  These Extensions can be stacked, so you can multiply your reach as far as you need.  At 300mm in length, it is a manageable, yet useful size. Built to the same quality standard as our ultra-durable Hole Saws.

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