On Monday, 9 November 2020 at 20:07:25 UTC, No Name wrote:
Right, I need to drop some networking and coaxial cables down from the
loft into a bedroom.

Drilling a hole in the ceiling wall plate is easy from the loft side to
pass said cables through.

half way down the wall is a noggin.

I wish to mount the wall socket lower down than this noggin and run the
cables to the wall socket.

I dont really want to cut a hole in the PB to access said noggin to
drill a through hole.

Is there such a thing as a 1.5m m long drill bit extender I can place
between my wood boring bit and the electric drill?

being able to do this would be a time and a making good time saver!

S.
Get a piece of steel conduit of suitable length. Affix a wood boring bit slightly larger than conduit diameter to business end and create a driving attachment for the top to fit your drill. Use this to do the business then remove your cutter and driver. Use the conduit to pass the cable through the noggin, possibly secure the top end of the steel conduit in the loft and leave it there to provide mechanical protection to the cable in the noggin as it's unlikely to be 50mm from the surface.