Kupo Spring Type Safety Pin

The Kupo KS-169 Spring Type Safety Pin is a zinc-plated steel R-clip, 8.5cm long and 3mm in diameter, sold as a set of 5. Also known as a hairpin cotter or hitch pin clip, it fits through the safety pin hole on a 5/8" (16mm) baby pin to lock a grip head, gobo head, or other fixture securely in place, adding a cheap and reliable safety backup to any stage or camera rigging setup.