Kayak/SUP Transducer Mounting Arm made of high strength composite material that will give you years of service - without any corrosion problems. Also included is the 415 Slip Discs that offer micro adjustments when needed. The Scotty Transducer mount telescopes from 11.5 inches to 18 inches when fully extended and swivels 360 degrees. Includes the Scotty post mount that fits into any Scotty Rod Holder mount.