A pack of 10 locking clutches to keep your enamel pins more secure. These are recommended for pins on jackets, backpacks, etc. It is more secure than rubber backings since it grips the notch on the metal post, and it can't be removed unless the spring-loaded top is pulled outwards. 

My enamel pins all have two posts on the back, so this pack of 10 clutches is enough for 5 enamel pins.