on 24/03/2018, Brian Gaff supposed :
Define 'holding', though I never found them very good, but then,I'm cack
handed with electric drills!

Well, you hold the drill at the point where you intend the hole and
apply just a little pressure. Too much and the SDS action fails. It is
not a brute force instrument, or rather one which needs brute force to
be applied, it does the work.