Silver Pin Keeper 6 Sets of 12 Ball Head - Spring Loaded Silver Brass 72 Total Pin Keepers
Each pin keeper is approximately 1/4" deep x 3/8" diameter
Don't lose any of your pins, keep them secure by locking them in place with this handy set.
Just slide these on like any other pin back. No tools are required. The spring loaded internal mechanism holds your pins in place until you pull on the Pin Keeper - releasing the spring to release the grip.