The Quick Action Clamp with 1-1/8" Socket from Avenger is a high-capacity lighting clamp constructed of gravity-cast aluminum that ensures professional-grade performance. When securely tightened the clamp can support up to 220 lb, an impressive feat for a device that weighs only 3.1 lb. It attaches to most luminaries via a non-threaded 1-1/8" socket and features a wide clamping range compatible with most industry-standard pipe diameters.