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