Shakespeare Style 4720 Economy Rail Antenna Mount Shakespeare's Style 4720 Economy Rail Mount is designed for quick and easy installation on vertical or horizontal, straight or angled rails. Its simple design makes installation a snap. The vice section grips the rail, and the flat section supports the antenna. The flat section can also be bolted to a flat surface, instead of to the rail grip. * Standard 1' - 14 thread * Nylon adapters included for 7/8', 1', and 1-1/4' vertical or horizontal rails * Stainless steel construction