Compatible with Humminbird & Raymarine Fish finders, GPS Chartplotters. Compatible with Lowrance Fish finders and GPS Chartplotters: HDS Carbon 7, HDS LIVE 7, Hook Reveal 7 Series, Hook Reveal 9 Series. Compatible with Garmin Fish finders and GPS Chartplotters: ECHOMAP Plus 72cv 73cv, 74cv, 75cv 77cv; GPSMAP 722, 722xs, 742, 742xs; Striker Plus 5cv, 7cv, 7sv. The round base & rectangle plate made of 6061-T6 aluminum alloy material with CNC machining and iii grade hard anodized surface. The medium double socket arm made of powder-coated, 6061-T6 aluminum alloy for durability and reliability in the most demanding marine environments. The rectangle plate includes a 1.5" C size TPU ball and contains a variety of pre-drilled holes that are compatible with several marine electronic devices, including fish finders and chartplotters. The medium double socket arm has a total length of 5.7"(14.5cm), compatible with RAM Mounts C size 1.5" Ball components. The round base includes a 1.5" C size TPU ball and contains pre-drilled holes, including the universal AMPS hole pattern. The marine electronic mount consists of a 2.4" diameter round base, a 5.7" medium double socket arm and a 6.25" x 2" marine electronic rectangle plate.