This flush-mounted bronze housing protrudes less than 1/4" outside the hull and 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 and high frequency versions provide maximum flexibility for the choice of frequencies. An excellent choice for fiberglass and wood hulls. Transducer kit comes with installation instructions. Follow the instructions carefully to avoid damaging your boat.