Ram Mount - Humminbird - Lowrance Elite/Mark The RAM-107U Humminbird and Apelco Series RAM mount is designed with a RAM 1.5 diameter patented rubber ball and socket system that has adjustment point at the cradle bases. With a twist of the arm knob, you can move the Humminbird and Apelco marine mount to your optimum viewing position. The RAM-107 is compatible with the following marine fishfinder models: Humminbird 700 Series Humminbird 500 Series Humminbird 300 Series Humminbird 100 Series Humminbird Matrix Series (excluding Matrix 97) Lowrance Elite Series Lowrance Mark Series Material: Powder Coated Marine Grade Aluminum Ball Size 1.5 Rubber Ball Size