The Shakespeare Ratchet Rail Mount's ratchet-action design allows for quick and easy installation of your antenna on 7/8" and 1" vertical or horizontal rails. A special cable slot eliminates the removal of most factory-installed connectors. Constructed of heavy-duty stainless steel, the mount is capable of handling antennas up to 8' in length and features a standard 1"-14 thread (male). Model#: 4190. Cable slot eliminates removal of factory connector Heavy-duty stainless steel construction Handles antennas up to 8' in length | Ratchet Rail Mount for 7/8" and 1" Rails