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John Rumm typed:

Mark wrote:

The more difficult - ie harder types of concrete or masonry will
laugh at a hammer drill and masonry bit - you need SDS.

Hmm perhaps you would like to explain to anyone still interested in
this thread from a technical point of view, why this is so ?

Insufficient energy per percussion...

So the criteria of a SDS chuck in itself Is irrelevant, otherwise we would
never been able to drill a hole in hard masonry before its invention.

Obviously (before im corrected) if you increase the percussion energy
beyond a certain point, a drill bit in a 3jaw chuck will slip and rotate,
but SDS does not define the suitability of the drill for the job.

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Mark§