Scotty Transducer Mounting Arm is designed for kayaks and small boat use. Made of high strength composite material that will give you years of service- without any corrosion problems. Telescopes from a compact 11.5 to 18" length. Fully adjustable design allows for any angle. Includes: Scotty 241L Locking Side/Deck Mount, Scotty Post Mount, Scotty 415 Slip Disk for micro adjustments, and Scotty Transducer Arms. (Transducer not included).