Nice packing: metal locking pin backs are packed in a transparent plastic box,Each box contains 100pcs metal locking pin backers. Pin Locks suits for lapel pins, badges, hat, tie tacks, name tag, toy pins, citation bars,etc..Super practical: These metal locking pin backs are totally awesome! because they keep the pin from moving around.The soft metal locking pin back effectively isolate sharp metal pins and ensure they remain in place，Great replacement for pin clutch backs..If you wear lapel pins on the reg. Throw away the rubber backs that don't grip and replace them all with these metal locking backs that won't fall off,leaving your pin lost on the ground somewhere. They have great grip, and don't loosen with time..The pin back is tight and they are not easy to fall off; Each pin back has a hole which is compatible with the tie tack pin，The metal locking pin backs are only compatible with the pin 1-1.2 mm in thickness, it can't fasten if the pin is too slim..Put the pin in the metal locking pin backing, your items will keep pinned securely. With smooth opening and closing, yet the pin back clasp is well secured because of the pin backs locking feature.