In message
Geo wrote:

On Mon, 28 Jan 2008 21:03:43 GMT, Barry Smith
wrote:

snip
I thought it would be easy to find a long 25mm bit. It was. One such
beast is a Rawlplug 32-350 at 35mm x 300mm but I can't find any
website that specifies the shank diameter.

I have the screwfix 12338 20mm (£5.89) but they also do a 25mm 11968 (£8.49).
The shank on the 20mm is 1/2" (nearly 13mm).

Thanks for the info.

Barry
--