Push open to take rings on and off. Use for your custom pendnats, thick and sturdy. It is a little over 3/4" long. Use for cuban link chains, crosses, and more. Simple elegant design. Use instead of jump rings, or as an enhancer. Sturdy. This clasp has the ability to extend a bracelet or a necklace chain, divide or double up a chain, combine multiple chains, or clip a charm or pendant onto a chain.