GT12M Bronze Thru-Hull - 350W - 12 Degree. Fits Various Hull Types. Transducer Supported Deadrise/Transom Angles: 12° supports hull deadrise angles from 8° to 15°. 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 800’ in saltwater and 1,200’ in freshwater.