I've seen them in use but never used one, some instructions would have been handy. They seem to slip into the clip and allow you to pull them to the clip's larger hole so they pop off the studs the clips are held in by. When they are pulled in that manner they lower and loosen grip on the trim and you can remove trim and remove clips from around your windshield or rear window for resealing or replacement. 1 star off for no instructions.
Rating: [4 of 5 Stars!]