Rear doors have a peg like a metal cotton reel on the bottom and they fit into a notch out of the tread plate/sill when the door is closed.

Anyone know whether I can unscrew them without anything dropping off inside the door?

My panel beater needs to gain access to remove a dent.

There's a chance it will have either a captive nut or a flat square nut on the back.

It has a Torx 30ish slot in it. So it's asking for me to give it a go lol