Sturdy & Durable: The 2.25" ball large fish finder mounting plate made 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 Wide Application: The marine electronic mounting plate consists of a D size 2.25" anti-slip TPU ball connected to a 5.04" x 2" rectangular plate. The plate includes 16 pre-drilled holes for compatibility with a wide range of marine electronic devices and mounts. In some applications, You can also drill additional holes to properly fit your electronics Universal Compatibility: The rectangular plate compatible with RAM Mounts and any other D size 2.25" ball components, also compatible with VAZESWIN D size 2.25" ball double socket arms Solid Heavy-Duty: The universal 2.25" ball mount base thickened to 8.5mm and ideal for mounting large heavy-duty fish finder, GPS chartplotter, depth finder, navigation, monitor, radio and other marine electronic devices 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 Compatible with Lowrance fish finders and GPS chartplotters: HDS Carbon 7, HDS LIVE 7, Hook Reveal 7 Series, Hook Reveal 9 Series Compatible with Humminbird fish finders and 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). Compatible with Raymarine GPS chartplotters and fish finders Note: The package does not include installation screws and other hardware The 2.25" ball 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