RAM Drill-Down Double Ball Mount for Humminbird Piranha - The RAM-B-107-1U, powder-coated marine grade aluminum mount, consists of a double socket arm, one 2.5in diameter round base, and connecting Humminbird/Eagle/Lowrance marine base. The mount is designed with a 1in diameter patented rubber ball and socket system that has adjustment points at the cradle base and bottom base. With a twist of the arm knob, you can move the marine mount to your optimum viewing position. Compatible Devices Eagle Cuda 240i Cuda 240 Cude 168 Cuda 128 FishEasy 320C FishEasy 320C Humminbird Piranha MAX 10 Piranha MAX 15 Piranha MAX 20 Lowrance X-4 X-4 Pro