Dave Plowman (News) wrote:
In article ,
linkuk wrote:
What sort of power drill are you using?
Do you need one hole, or ten thousand?

Sorry forgot the first question:
Its a bosch mains drills with hammer action.

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...

I have found the BIT quality to be the key thing, followed by a good
hammer action. You need to smash through embedded flints. This takes
more than a run of the mill masonry bit.