These are nylon clips that I have modified to fit the 55-57 Chevy Belair sedan. You can't find good metal clips for the quarter windows and I found that the repros didn't work well for the 56 sedan I was working on. I found these clips and have modified them to clip into the upper quarter window moldings and they work great. No rust issues and they allow the moldings to snap right into the body with little effort. This is a set of 14 clips to do both upper quarter window moldings. FREE SHIPPING!