Sturdy & Durable: The 1.5" 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 Package Includes: The mounting base is made of a 1.5" anti-slip TPU ball connected to a 2.4" diameter round base, including a variety of pre-drilled holes with industry-standard AMPS hole patterns 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: Ideal for use as a mounting plate to support electronic devices to mount cell phone, tablet, camera, fish finder, gps chartplotter, navigation, radio and other various Garmin/Lowrance/Humminbird/Raymarine electronic devices Wide Application: Ideal for use as mounting base on boat, kayak, semi-truck, car, truck, treadmill and a variety of off-road vehicles General Compatibility: 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 Note: The package does not include installation screws and other hardware The 1.5" 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