Shakespeare Economy Rail Antenna Mount. Its simple design makes installation a snap. The vise 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 Specifications for Shakespeare 4720 Economy Rail Antenna Mount: Manufacturer: Shakespeare Color: Black Features of Shakespeare 4720 Economy Rail Antenna Mount Fits 7/8" 1" and 1-1/4" rails Compatible with vertical horizontal square and round rails Standard 1 14-thread (male) May be mounted on flat surfaces Package Contents: Shakespeare 4720 Economy Rail Antenna Mount Shakespeare 4720: Economy Rail Antenna Mount 4720