The RAM-111B-354-TRA1U consists of a Track Ball™ base that can attach to any track system including the RAM Tough-Track™. Connected to the base is a standard length double socket arm and 6.25" x 2" rectangle plate for supporting a wide range of fishfinders and chartplotters. The rectangular plate contains different combinations of pre-drilled holes which will match up to many electronic devices and mounts, including Marine GPS, CB Radios, Ham Radios, Gimbal Brackets and more.