In article ,
Jon Harris wrote:
My basic B&D hammer drill just doesn't seem to have the guts to make any
impression on the concrete. What bit should i be using and are there any
other tips you could give this frustrated DIY newbie?!

You need an SDS drill, I'm afraid. Uses a different method of 'hammering'
which is strong enough to go through concrete.

--
*Everybody lies, but it doesn't matter since nobody listens.

Dave Plowman London SW
To e-mail, change noise into sound.