KUPO black Nugget Coupler (KCP-860B) is a lightweight and low profile professional coupler, constructed from high tensile aluminum extrusion. It has been developed for installations where load capacities of up to 264lbs (120kg) are required. Nugget Coupler is designed to fit tubes with diameters between 32mm-38mm (1.26"-1.50"). It has double level's counter sunk for M10 or 3/8" hex head. Equipped with an M10 bolt and nut. Unique windows for safety wire access through. Hook struct of top opening section limits the open pace that offers assistance to rig, and two fitting bases let it become a multi-function coupler. A captive on top of thread bolt to avoid wing nut falling off the clamp. TUV certified, and ideal for TV studio or theater.