"Bert Coules" wrote:
Andy Burns wrote:

The cheaper ones only have rotary-hammer mode, more expensive ones allow
roto-stop and non-hammer modes too.

Ah, that makes sense, thanks. Is roto-stop hammer-action but no
rotation? I can see that would be useful: like having a powered masonry chisel.

Not just a masonry chisel, you can get SDS wood chisels.

If choosing a drill with rotostop, it's essential to check how it works on
that particular drill. Some cheap ones stop the rotation but do not lock
the chuck. This means that the chisel will twist around as you work. Not a
problem with a point but a problem with flat chisels.