KUPO black Nugget Swivel Coupler (KCP-862B) is a lightweight and low profile professional coupler, constructed from high tensile aluminum extrusion. Working load limit is up to 120kgs (264lbs). Nugget Coupler is designed to fit tubes with diameters between 32mm-38mm (1.25"-1.5"). For quick and easy interconnection for truss, pipes or bars. It has double level's counter sunk for M10 or 3/8" hex head. Unique windows for safety wire access through. Hook struct of top opening section limits the open pace that offers assistance to rig. A captive on top of thread bolt to avoid wing nut falling off the clamp. TUV certified, and ideal for TV studio or theater.