Sturdy & Durable: The fish finder mounting plate is constructed of solid marine-grade 6061-T6 aluminum alloy, CNC machined, and III grade hard anodized surface finishing to ensure reliability and durability in the most challenging environments Package Includes: The rectangle plate includes a 1.5" C size anti-slip TPU ball and contains 20 pre-drilled holes that are compatible with several marine electronic devices. You can also drill additional holes for mounting the electronics properly Universal Compatibility: Compatible with RAM Mounts and any other C size 1.5" ball components, also compatible with VAZESWIN all C size 1.5" ball double socket arms Compatible with Various Devices: The universal 1.5" ball marine electronic plate is ideal for mounting fish finder, GPS chartplotter, depth finder, navigation, monitor, radio and other marine electronic devices. Also compatible with RAM Mounts/Arkon/iBolt other electronic devices Wide Application: 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. General Compatibility: Compatible with Lowrance Fish finders and GPS Chartplotters: HDS Carbon 7, HDS LIVE 7, Hook Reveal 7 Series, Hook Reveal 9 Series Partial Compatibility: Compatible with Humminbird & Raymarine Fish finders, GPS Chartplotters. (Please Note: Not compatible with the Humminbird Helix 5, Helix 7, Helix 8, Helix 9, Helix 10, Helix 12, Helix 15 and Solix 10) Note: The package does not include installation screws and other hardware The rectangular base is made of solid aircraft-grade aluminumoy, CNC machine with powder-coated to ensure reliability and strength in the harshest environments