The RAM-107BU is a marine grade aluminum base with 1.5" rubber ball. The base connects to the underside of Humminbird and Raymarine marine GPS devices.

RAM 1.5" Ball Marine Electronic Base (RAM-107BU)
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The RAM-107BU is a marine grade aluminum base with 1.5" rubber ball. The base connects to the underside of Humminbird and Raymarine marine GPS devices.