In article ,
The Natural Philosopher wrote:
If the concrete is hard it will laugh at a hammer drill and masonry
bit. The only way to go is SDS.

Why? SDS is only how the bit is held in, it says nothing about the power
of the drill, its hammer action, or the quality of the bit being used,
all of which seem rather more relevant than three letter painted on the
side of the drill casing...

If you say so. I take it you've never used either on something hard?

--
*Why are a wise man and a wise guy opposites? *

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