(NOT compatible with: the Humminbird Helix 5, 7, 8, 9, 10, 12, 15, the Solix 10). Package Includes: The marine electronic mount consists of a 2.4" diameter round base, a 9.1" long double socket arm and a 6.25" x 2" marine electronic rectangular plate The c size 1.5" rubber ball ensures a secure grip, capable of supporting up to 15.5 lbs at rest and 4.5 lbs in motion, while allowing for 360-degree rotation. Equipped with heavy-duty multi-angle drill base solution for easy mounting on boats, or other marine vessels. Compatible with a wide range of fish finders, GPS chartplotters, and other marine electronics from brands such as Garmin, Humminbird, Lowrance, and more. Compatible with Garmin: GPSMAP 722, 722xs, 723, 723xsv, 742, 742xs, 743, 743xsv, Striker Plus 5cv, 7cv, 7sv, 7cv, 7sv, ECHOMAP Plus 72cv, 73cv, 74cv, 75cv, 77cv. Compatible with Lowrance: HDS Carbon 7, HDS LIVE 7, Hook Reveal 7 Series, Hook Reveal 9 Series, Elite FS 7, Elite FS 9. Compatible with Humminbird & Raymarine Fish Finders, GPS Chartplotters. (NOT compatible with: the Humminbird Helix 5, 7, 8, 9, 10, 12, 15, the Solix 10). Xik Aluminum alloy 9.1" long arm Fish Finder Mount with C Size 1.5"/38mm Ball Rectangle Plate & Round Base，Compatible with Garmin, Lowrance, Humminbird, Raymarine and More