Wanted an old fashioned Edison bulb but stringed modern LED strings. The rather heavy cable and lamp connectors and slightly loose plug and socket made me wonder how I would keep the lights connected. I remembered seeing a similar device and decided to order a few. I'm glad I did. The body of the clamshell comes apart easily and I was able to splice my two most problematic strings together quickly and easily! And so! The cord didn't pull out even after a good pull when I finished tying the last rope. I love them and I'm glad I have them.