Package Includes: The electronic device mount consists of two 2.5" diameter round bases and a 3.5" medium double socket arm Round Base: The round base includes a 1" B size TPU ball and contains pre-drilled holes, including the universal AMPS hole pattern. Ideal for direct installation on boats, kayaks, or any flat surface Medium Arm: The medium double socket arm has a total length of 3.5"(9cm), compatible with RAM Mounts B size 1" ball components. Features ball and socket design for a secure grip and 360° adjustable rotation Sturdy & Durable: The round base made of 6061-T6 aluminum alloy material with CNC machining and iii grade hard anodized surface. The medium arm made of powder-coated, 6061-T6 aluminum alloy for durability and reliability in the most demanding marine environments Ideal for use as marine electronic device mounts for mounting fish finders, GPS chartplotters, depth finders, navigation, radios, etc. Compatible with Garmin, Lowrance, Humminbird & Raymarine fish finders and GPS chartplotters Ideal for use as other electronic device mounts, such as phone mounts and tablet mounts for mounting on semi truck, car dashboard, vehicle, truck, boat, sailboat deck, pontoon boat, kayak, table, treadmill, off-road vehicles and recreational vehicles, etc. Compatible with Garmin: Striker 4, Striker 4dv, Striker Plus 4cv, Striker Vivid 4cv, echo 100, echo 150, echo 300c, ECHOMAP Plus 42cv, ECHOMAP Plus 43cv, ECHOMAP Plus 44cv, ECHOMAP Plus 45cv, ECHOMAP UHD2 Note: The package does not include installation screws and other hardware Made of powder-coated, aluminum alloy for durability and reliability in the most challenging environments