RAM Marine Humminbird / Lowrance "RUGGED USE" Electronic Base attribute-drill-down Plate diameter: 63

Plate diameter: 63

8 x 35mm socket head cap screws

Montana® 610t

so there's still some tension on one of the balls when you loosen the arm to reposition it

5" (63mm) round AMPS base for near-infinite adjustment

RAM Marine Humminbird / Lowrance "RUGGED USE" Electronic Base attribute-drill-down Plate diameter: 63RAM 107BU RAM Fishfinder Ball Adapter for Humminbird Devices (Rugged Use) The RAM 107BU is a 1. 5" ball "rugged use" marine electronics base for the Humminbird 100, 300, 500 and 700 Series, Matrix Series, and Lowrance Elite 5 Series. It connects to the underside of compatible devices and mates to any RAM C series double socket arm. Key Features Adaptor for heavier Humminbird, Lowrance and Raymarine devices 1. 5" ball mates to any RAM C series arm