With this YS Adapter, you can attach your Tovatec Fusion 1000 LED Dive Light to an underwater tray arm that features a standard YS connector. This setup will enable you to use the Fusion as a video light. The adapter's ring, which fits around the light, measures 1.6" in diameter. Below the ring, a large knob on the side allows for easy turning with or without diving gloves, so that you can slide the bolt in and out of the holes in the adapter and the lighting arm. Additionally, a wing nut is easily threaded onto the other side to let you tighten and loosen the bolt.