RAM D Base Mount Ball Only 2 - 7/16in Base with 2 - 1/4in (5,7 cm) Size D Ball Part #: RAM-D-254U 2 7/16in DIA BASE WITH 2 1/4in BALL (AMPS)Powder Coated Marine Grade Aluminum2.25 Inch Rubber BallBlack Powder Coated.
RAM 3.68 DIA BASE - 6 HOLES W/ 1in DIA POST Size D 2-1/4in 5,7 cm Size D Ball 3.68 DIA BASE W/ 1in DIA POST 6 HOLES2.25 Inch Rubber BallPowder Coated Marine Grade AluminumBlack Powder Coat
Lowrance MB36 RAM-D-111U-C Short Arm Marine Electronics Mounting Bracket HEAVY DUTY Type D 2.5 inch Diameter Ball Length SHORT C