Kayak/SUP transducer mounting arm made of high strength composite material, which will give you years of service without any corrosion problems. Also included are 415 Slip Discs that offer micro adjustments when needed. The Scotty Transducer for telescopes from a compact 11.5 inches to 18 inches when fully extended and swivels 360 degrees. Includes the ever popular Scotty Post Mount that fits on any Scotty Rod Holder Mount.