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. RAM double socket arms with their distinctive Hourglass Shape are designed and recognized to provide the best possible performance for most any application. The Hourglass Shape is a registered trademark of National Products Inc.