I had made a mistake in my choice of 2G11 sockets, not realizing the socket did not hold the bulb securely which would have caused broken UV lightbulbs for sure. I racked my brain for a DIY design that would hold the bulbs in place so they didn't bang together and break. My day was saved when I didn't have to create something myself when this spring clip appeared in my online search and it was EXACTLY what I needed to complete my project