With the Delta 3 Extended Ball Joint Clamp from Aquatica's Technical Lighting Control line, you can join together 2 ball mounts with 1" diameters. Connect a ball base on an underwater camera tray or grip handle to a lighting arm, or connect two arm sections together. Additionally, you can use the clamp to attach a strobe or video light to the end of an arm.This extended version gives you about an extra 1" of length on each side of the clamp, allowing for greater freedom of movement when using buoyancy compensation arms. The longer reach can also help when mounting a focusing light. Built to last, the unit is made from aluminum that has been hard anodized and treated with Teflon for resistance to corrosion and other wear and tear.