The marine electronic plate consists of a B size 1'' TPU ball connected to a 6.25" x 2" rectangle plate. The rectangle plate features 20 pre-drilled holes will match many electronic devices and mounts, including marine fish finders and GPS chartplotters, CB radios, Ham radios, gimbal brackets, and more NOTE: This plate is a universal mounting bracket with a variety of mounting hole locations. In some applications, additional holes may need to be drilled to properly fit your electronics The rectangular plate made of 6061-T6 aluminum alloy material with CNC machining and iii grade hard anodized surface for durability and reliability in the most demanding environments. TPU over-molded ball head, anti-slip and wear-resistant The 1'' ball square plate compatible with BRCOVAN any B size 1'' ball double socket arms. Work for other devices with 1 inch swivel ball mounting pattern Compatible with Lowrance GPS Chartplotters and Fishfinders: HDS Carbon 7, HDS LIVE 7, Hook Reveal 7 Series, Hook Reveal 9 Series. Compatible with Humminbird GPS Chartplotters and Fishfinders. Note: does not fit Helix 5, 7, 8, 9, 10, 12, 15 and solix 10. Compatible with Raymarine GPS Chartplotters and Fishfinders The main body of the base plate is made of 6061-T6 aluminum alloy material with CNC machining and iii grade hard anodized surface for durability and reliability in the most demanding environments. TPU over-molded ball head, non-slip and wear-resistant. Compatible with BRCOVAN any B size 1 inch ball double socket arm.