The CMA372 makes installation to all styles of 1.63" Unistrut/U-Channel simple. -Ships with spring nuts and bolts for attaching to Unistrut/U-Channel. -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.