Helm AB-Series Antenna Mount fits 1" to 1-1/4" antennas. For use with Loran and standard marine antenna. Mounts horizontally or vertically on round or square rail. A "U" groove in the 1"-14 threaded fitting allows Loran coupler center wire to exit through the side. The mount is a sturdy, anodized aluminum extrusion and comes complete with all stainless steel mounting hardwared. One complete unit per package.