The hole is 1/4". The shaft itself is a touch under and is D shaped so the
hex set screw tightens against the flat. Note that the hole in the shaft is
round, not D.
billh

"Tom Storey" wrote in message
news:RiAxf.95596$tl.30835@pd7tw3no...
Anyone able to tell me the diameter of the termite bit shank? I have a
couple of drilled handles and I may be able to do with just the bits and
sharpening stuff.

Thanks

--
Tom in Qualicum Beach, BC