This special part allows you to glue in place a stop. Great for setups you want to be able to dismantle quickly, for use as a spacer or perhaps to ruggize the end of a boom that might be subject to damage. Also has some applications as a part to build your own custom mounts from. Laser cut from 3/16 aircraft grade plywood. Rugged enough for most any use. Each package contains 4 stops. SKU Number: RRCSSBS