Injection molded UV stabilized nylon construction. Dual swiveling mounts for full adjustability. Designed to feed the antenna wire directly through the base, which eliminates the need for a separate cable outlet, thus reducing potential areas for water leakage. Control knob allows for quick and easy adjustment,  ridding the potential of mooring, fishing or other lines getting fouled on a handle. Accepts any standard antenna with 1" - #14 threads. Installs with four ¼” FH fasteners (not included).