Made of high strength composite material Designed for kayaks and small boat use Telescopes from 11.5" to 18" and swivels 360° This fully adjustable design includes the No. 415 Slip Discs that offer infinite micro position changes Includes #438 Gear-Head Track Adapter & 440-4 Low Profile Track Drop and lock a Fishfinder Mount or any other Scotty post-mount accessory on top of the #141