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 1.5" 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 Wide Application: The fish finder mount consists of a C size 5.7" length double socket arm, a 6.25" x 2" marine electronic mounting plate with 1.5" TPU ball and a round bar clamp base. Securely holds 7"/9"/10"/12" electronic devices Anti-slip Rubber Ring Insert: The 1.5" 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 Universal Compatibility: The fish finder mounting plate includes a C size 1.5" 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: GPSMAP 722, 722xs, 723, 723xsv, 742, 742xs, 743, 743xsv, Striker 5, 5cv, 7cv, 7sv, 7cv, 7sv, vivid 5cv, 7 series, vivid 9sv, ECHOMAP Plus 72cv, 73cv, 74cv, 75cv, 77cv, 8410, 8410xsv, 8412, 8412xsv, 8416, 8416xsv, 8610, 8610xsv, 8612, 8612xsv, 8616, 8616xsv, 922, 922xs, 923, 923xsv, 93, 93sv, 942, 942xs, 943, 943xsv, 106sv, 1223, 1223xsv, 1243, 1243xsv, Plus 72cv, Plus 73cv, Plus 74cv, Plus 75cv, Plus 77cv, Plus 9", CHIRP 72, 73, 74, 75, 92, 93, 94, 95, ECHOMAP Plus 72-97 Series, ECHOMAP UHD 62-95 Series, ECHOMAP Ultra 102sv, ECHOMAP Ultra 106sv, Garmin Echomap Ultra 126SV, other fish finders and GPS Chartplotters Compatible with Lowrance: Eagle 7, Eagle9, Elite FS 7, Elite FS 9, Elite-7 Series, HDS Carbon 7, HDS LIVE 7, HDS LIVE 9, HDS LIVE 12, HDS PRO 9, HDS-5 Series, HDS-7 Series, Hook Reveal 7 Series, Hook Reveal 9 Series, HOOK-7, HOOK-9, HOOK2-7 Series, HOOK2-9, 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 Made of powder-coated, aluminum alloy for durability and reliability in the most challenging environments