Yea, that's a good 'ol SnapToggle, as Derek posted. I'll try my best to explain how it works. The
bolt is put in backwards btw.
The metal part goes against the back of the (hollow) wall, which, as it is oriented, would be on the left. The little white collar right next to the metal part gets slid down the long white pieces to hold the metal piece in place tightly. (It's slid all the way down tight) The long white pieces then separate and break off, leaving just the collar on top. The
bolt then goes in from right to left, through the white collar and into the metal.
I've used them quite a few times, and I hate them. I'll take a
toggle and a really long
bolt any day, it's stronger, easier to use, and less prone to stupid breakage. Also, real
toggle bolts can be used to put something else (plywood, 2x4,
etc.) flush with the wall, whereas these have those stupid little collars on top of the wall.
As you can tell, I've had some bad experiences...