NRG Fender Washer Kit, Set of 10, Purple, Rivets for Metal - FW-110PPFender Washer for Metal 10 Pack of our famous "Fender Washers" or dress up bolt kits. Basically, you can either pop these into any m6x1 thread on your vehicle (Most common size found on passenger vehicles), replacing old, ugly, rusty hardware for a more refined look or you can drill a hole in the surface and use the provided Rivnuts and Rivet tool to install. The Anchors provided in the FW 100 kit are best when used with metal or sheet metal surfaces.