RAM 2.5″ Round Base with the AMPs Hole Pattern, 1″ Ball & Hardware for the Garmin echo™ 100, 150 & 300c The RAM-B-202-G4U consists of a 1″ diameter rubber ball connected to a flat 2.5″ diameter base. This mount has pre-drilled holes, including the universal AMPS hole pattern. Included are 3x (#8-32 x 5/8″ PH [...]