An ideal solution when you need extension to mount your fishfinder or chartplotter at the perfect angle. With two pivot points, the swing arm allows for complete 360-degree rotation. The 6.25" x 2" rectangular base features pre-drilled holes and is compatible with a range of marine electronics including Eagle, Garmin, Humminbird, Lowrance, and Raymarine. Description Horizontal Mount Ball 1-1/2"