Using this Compact 1" Ball Arm for Quick Release Handle from Ikelite, you can add an optional strobe or constant light source to your underwater photography or video system. The arm segment, measuring 7" long, connects to a QR mount that enables easy attachment to the top of the quick-release handles on Ikelite's trays for camera housings. In addition to a standard ball clamp, this package includes a second clamp with an auxiliary mount to allow for the attachment of a focus light, or a top handle if you're using two arms.