RAM Fishfinder Diamond Plate Mount for Humminbird Devices (RAM-B-107U-238) (sku 54651)The RAM B 107U 238 consists of a double socket arm, diamond base and connecting Humminbird Apelco marine base. Designed into the mount is a 1" diameter patented rubber ball and socket system with adjustment points at both socket ends of the arm. The diamond base contains two holes 1. 912" from center to center, positioned at both ends of the base. Rubber ball and socket technology allows for almost infinite adjustment and perfect viewing angles.