Package Includes: The fish finder mount consists of a B size 5.9" length double socket arm, a 6.25" x 2" marine electronic mounting plate with 1" TPU ball and a round bar clamp base. Securely holds 7"/9"/10"/12" electronic devices. Features ball and socket design for a secure grip and 360° adjustable rotation Sturdy & Durable: The main body of the round bar clamp base and rectangular plate are made of 6061-T6 aluminum alloy with CNC machined and III grade hard anodized surface, the 1" ball double socket arm is made of solid marine-grade aluminum alloy with powder-coated to ensure durability and strength in the most demanding environments Anti-slip Rubber Ring Insert: The 1" TPU ball round rail clamp base of marine electronic mount comes with four sizes soft rubber ring inserts that provide a snug fit and protect the mounting surface. The bar clamp base fits for 1.5"(38.1 mm) / 1.65"(41.91 mm) / 1.75"(44.45 mm) / 1.85"(46.99 mm) / 2"(50.8 mm) diameter round rails. An allen key is included in the package for your convenience to install Wide Application: The fish finder mounting plate includes a B size 1" TPU ball and contains a variety of pre-drilled holes that are compatible with several marine electronic devices, including fish finder, GPS chartplotters, depth finders, CB radios, ham radios, gimbal brackets 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, and other fish finders and GPS chartplotters Compatible with Lowrance fish finders and GPS chartplotters: HDS Carbon 7, HDS LIVE 7, Hook Reveal 7 Series, Hook Reveal 9 Series, and other fish finders and GPS chartplotters Partial Compatibility: Compatible with Humminbird & Raymarine Partial Fish Finders, GPS Chartplotters. (Please Note: Not compatible with the Humminbird Helix 5, Helix 7, Helix 9, Helix 10, Helix 12, Helix 15 and Solix 10) Please Note: Before purchasing, please measure the diameter of your round rail to ensure the bar clamp base will fit your rail Note: The package does not include installation screws and other hardware The Fish Finder Mount consists of a B size ball 5.9" length double socket arm, a 6.25" x 2" rectangle plate with a 1'' TPU ball and a large bar clamp base