This Lowrance HDI Trolling Motor Adaptor is a low profile trolling motor mount designed for mounting the Lowrance HDI Skimmer Transducer - 83/200 kHz + 455/800 kHz (sold separately). Low profile design. Trolling motor trasducer mount. For mounting the Lowrance HDI Skimmer Transducer - 83/200 + 455/800 kHz.