Garmin GT12M Bronze Thru-Hull - 350W - 20 Degree [010-02867-02]GT12M Bronze Thru Hull 350W 20 Degree Designed for reduced drag and optimum sonar performance on midsize fishing and cruising boats, this flush mounted, 350 watt mid band CHIRP transducer clearly defines fish arches, structure, and bottom depth returns on your display. Midband Chirp Traditional Sonar This 8 pin, 350 watt bronze thru hull transducer features high definition mid band CHIRP sonar that clearly defines fish targets and structures down to