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 a compact 11.5 inches to 18 inches when fully extended and swivel 360 degrees. Includes the ever popular Scotty post mount that fits into any Scotty Rod Holder mount.