"The Garmin Airmar B175M Mid-Band CHIRP Frequency Thru-Hull Transducer lets you step up to 1kW CHIRP sonar easily. An excellent choice for fiberglass and wood hulls, this Garmin CHIRP transducer installs without a fairing thanks to its slim design: a flush-mounted bronze housing that protrudes less than .25"" outside the hull and can sit on the trailer rollers or bunks without damage. The tilted element inside the transducer accommodates all hull deadrises and eliminates the need for a fairing block. This 8-pin Mid-Band CHIRP transducer has a max depth of 1,500' and an operating frequency of 85135kHz. Includes installation instructions. Lets you step up to powerful 1kW CHIRP sonar Excellent choice for fiberglass and wood hulls Slim design with flush-mounted bronze housing that protrudes less than .25"" outside the hull Can sit on trailer rollers or bunks without damage Tilted element to accommodate all hull dead rises and eliminates need for fairing block Incredible 1,500' max depth at 85135kHz"