I have used these bushings to protect 5/16 inch ID (7/16 inch OD) beer lines when they run through the walls of a cooler that I have converted into a jockey cabin. The holes on these grommets are just enough for the beer line to fit through, which is great as I wanted the length of the outer line to be adjustable without changing the length of the beer line or affecting the resistance level of the line. Since the walls of the cooler consist of an inner and outer plastic shell with foam filling in between, I had to use one spigot on the inner wall and the other on the outer wall. The specified hole size of 11/16 inch was also accurate. , these bushings snapped and fitted really well and they didn't "roll" in or out of the hole when the beer line was adjusted. I'm sure you could probably buy them cheaper in a store. Price on Amazon but you can't match the convenience of free 2 day shipping on such items. Excellent purchase!
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