Garmin GT12M Bronze Thru-Hull - 350W - 20 DegreeDesigned for reduced drag and optimum sonar performance on midsize fishing and cruising boats, the Garmin GT12M Bronze Thru Hull 350W 20 Degree is a flush mounted, 350 watt mid band CHIRP transducer that clearly defines fish arches, structure, and bottom depth on your display. Midband CHIRP Traditional Sonar This 8 pin, 350 watt bronze thru hull transducer delivers high definition mid band CHIRP sonar, producing crisp targets and reliable bottom