It pays to buy quality......

[phillpot]

The video in the advert (Gearbest on FB) shows these little chaps drilling and tapping in one go, using a cordless drill,

Not so sure I'd be that confident but reckon they could come in handy as thread restorers/cleaners, exhaust manifold threads in heads for example

[greymrj]

I have come into contact with a slightly different fixture, a self drilling and tapping bolt used for (at least by us) steel cladding and it was remarkably quick and effective and we could un-thread the bolts and remove the panels later. Some clever new stuff out there.

[phillpot]

greymrj said:

Some clever new stuff out there.

Not so sure about the "new"