Lexan Depth Transducer f/ST60 & ST290P19 Plastic Low Profile Through Hull Transducer Key FeaturesIncludes 45' cableFrequency: 200 kHzCompatible hull material: metal & fiberglassHole diameter for installation: 2" Compatible modelsST60+i50ST70 / i70 (requires ST70 depth pod or ITC5 - sold separately)