WINDFRD 1.5" Ball Medium Arm Marine Electronic Mount, Fish Finder Mount, Universal Mounting Plate with 1.5 inches / 38mm / C Size Ball Adapters, Compatible with Humminbird, Garmin, Lowrance and MoreUniversal Design Includes a C size 5. 5 length 1. 5 double socket arm and a complete flat surface, drill down mounting solution; The ball and socket technology allows for near infinite adjustability. Features 1. 5 inch 38mm C Size ball joints that are compatible with all industry standard 1. 5 inch 38 mm C size adapters and arms. Sturdy Use the most reliable materials to manufacture. Made of powder coated, marine grade aluminum for durability and