Ram Mount Marine Electronics Mount w/ Track Ball Base f/ Units Under 10 Lbs [RAM-111B-354-TRA1U]RAM 1. 5" Ball Mount with 6. 25" X 2" Rectangle Base, Double Socket Arm & Track Ball Base 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