Transom Mount Transducers Transom Transducers mount on the transom (back) of the boat in contact with the surface of the water. To prevent damage to the boat or transducer. Transom mount hardware is included with the transducer. Description: New transom mount transducer design. Single/Dual Beam, 20/60 Degree, 200/83 kHz with built in temperature sensor. New design is more secure and is not a prone to kick up at high force of waves. It has an improved running angle and a optional lock down screw to override the kick up. Has same hole pattern as some older version transducers For Use With: Matrix 10, 12, 15, 17, 20, 27, 67, 77c, 87c, 97, 717, 727, 737, 767, 777, 787, 323, 343, 363, 383, 141, 161, PMax10, PMax15, PMax20, PMax210, PMax215, PMax220, 917c, 931c, 937c, 957c, 997c, 515, 525, 535, 565,580, 585c, 595c, Piranha 2, Piranha 4, XP2000, XP4000 Warning [https://productimageserver.com/prop65/6pt.png]WARNING: This product can expose you to chemicals including LEAD which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov [http://P65Warnings.ca.gov].