Never lose a pins again. These pin keepers are the best quality pin savers that you can buy. Pin Keepers are simple to use. Each pin keeper has a set screw, which is tightened to the pin post to ensure it's securely locked on. Each pack contains 12 new pin keepers and an allen wrench to tighten the set screw. These are great to lock and hold your hat, cap, brooch or lapel pin in place and never have it come off.