This bronze thru-hull mount transducer performs well at high speeds and is an excellent choice for fiberglass and wood hulls. An excellent choice for fiberglass and wood hulls, this 8-pin 500 W transducer has a depth of 900 ft; an operating frequency of 77/200 kHz; a beamwidth of 45/15 degrees; and a 8 to 15 degree deadrise. Transducer kit comes with installation instructions. Follow the instructions carefully to avoid damaging your boat.*Do not use on metal hulls.