I can't find any information on them. My camper needs some because the last idiot that repaired it put 3 different kinds of twisty things on to secure it and they are all falling apart. I have two on the roof that secure the door up when trailer is folded. There are two above the door that help hold it up while the trailer is folded. And there are supposed to be two that secure the door against the frame while the trailer is popped up. They are held in by a single screw and twist. They have finger tabs on one side and like a duck bill on the other side to secure the door. There is also one for security on the door so the door can't open if it is twisted. sorry, no pictures. forgot to take pics and now it is packed away in storage.