Injection molded UV stabilized nylon construction with dual swiveling mounts for full adjustability. Designed to feed the antenna wire directly through the base eliminating the need for a separate cable outlet, reducing potential areas for water leakage. The control knob allows for quick and easy adjustment diminishing the potential of mooring, fishing or other lines getting fouled on a handle. Accepts any standard antenna with 1″ – #14 threads. Installs with four 1/4 FH fasteners (not included).