This flush-mounted bronze transducer is designed with a housing that protrudes less than 1/4" outside the hull. Low-profile design means the transducer can sit on the trailer rollers/bunks without damage. The tilted element inside the transducer accommodates all hull deadrises and eliminates the need for a fairing block. Low, medium, high, and high wide versions provide maximum flexibility for the choice of frequencies. The Airmar B175HW is an excellent choice for fiberglass and wood hulls. Maximum depth of 600'. Operating frequency of 150-250 kHz. Beam width of 25°. 16° to 24° deadrise. Transducer kit comes with installation instructions. No need for a fairing block Great for fiberglass & wood hulls | Garmin Airmar B175HW 20° Tilt Bronze Thru-hull Transducer