"GMM" wrote in message
...
I need to send a (network, not power!) cable through a door frame.
The plan is to go through the plaster beside the frame (a couple of
inches before an adjoining door), at a bit of an angle to come out on
the edge of the architrave on the other side. The total depth of this
hole will be 200 - 250mm (well, 8 - 10 inches anyway) and most of it
will be through timber.
.....
Why doesn't anyone sell a standard HSS/spur/multipurpose bit this kind
of length?

They do.

http://www.drill-service.co.uk/Produ...80000&Tool=328

If those are not long enough for you, the same company will make you just
about any drill you want.

Colin Bignell