Shakespeare Stainless Steel Boat Antenna, Ratchet Rail MountRatchet action, fast release design for quick and easy laydown. Mounts easily on 7/8" and 1" vertical and horizontal rails. 9/32" hole for cable feed-through. Handles antennas up to 8'. Heavy-duty construction.; Handles antennas up to 8'; Standard 1"-14 thread (male);