Sturdy & Durable: The 2.25" ball large round base made of 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 2.25" ball mount consists of a D size 2.25'' anti-slip TPU ball connected to a 3.7" diameter round plate. Including a variety of pre-drilled holes with industry-standard AMPS hole patterns Universal Compatibility: 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 round plate thickened to 8.5mm and ideal for use as a mounting plate to support electronic devices to mount large heavy-duty fish finder, gps chartplotter, navigation, radio, laptop and other various electronic devices. Can also be used as a mounting base for boats, kayaks and more 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 Note: The package does not include installation screws and other hardware The 2.25" ball round base 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