this is a single black sling swivel QD push button standard loop with base cup, which flush mount front and rear on the stock for stud free profile on your rifle or shotgun when sling and swivels are removed. Sling and swivel is quickly removed with a push of a button. Base cup sits inside the stock and glued in place using an epoxy glue, no screws required but it does have a hole if you want to use a screw to secure it more. select which one/s you want; 1) 1" to fit slings up to 1" (25mm) wide. 2) 1 1/4" to fit slings up to 1 1/4" (32mm) wide. Order as many as you want. ** I also have extra base cups listed separately.