WINDFRD Aluminum 1.5" Ball Fish Finder Mount for Hummingbird Helix 5,7, etc., C Size Universal Marine Electronics Mount, Compatible with RAM, Arkon, iBolt 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, arms and RAM accessories. Extremely Sturdy Use the most reliable materials to manufacture. Made of marine grade aluminum and