The Bridge Bar Medium for Olympus PEN from Beneath the Surface is a component in an underwater video lighting system. It connects the risers together to form a carry handle at the top of the camera tray assembly. The bridge bar removes any flex that you may have in the handles of your assembly. It also has a series of 1/4-20 holes across it, giving you multiple places to mount strobe arms, focus lighting and video lighting via accessories like the ball mount adapter #BMA and the cold shoe mount #CSM. While the bridge bar is designed for use with the Olympus PEN camera, it matches the tray width and will fit virtually any medium size tray.