Handles antennas up to 8ft</br>Special cable slot eliminates removal of most factory-installed connectors</br>Standard 1"-14 thread (male)</br>Heavy duty construction</br></br>Product Description</br></br>Ratchet action?? fast release design for quick and easy laydown. Mounts easily on 1"to 1-1/4" vertical or horizontal rails.  </br><br/>http://www.amazon.com/gp/product/B000XXU73E.