The CMA372 makes installation to all styles of 1.63" Unistrut/U-Channel simple. Ships with spring nuts and bolts for attaching to Unistrutr/U-Channel. Features: Features offset for transitioning cables out of extension columns Includes spring nuts and bolts to attach to 1.6." (41 mm) unistrut Installers can run cable up through the pole and directly out of the Unistrut adapter. Specifications: Weight Capacity: 500 lbs (227 kg)