The RAP-B-107U consists of a composite 2.5" diameter round base with the universal AMPs hole pattern, composite double socket arm and connecting Humminbird/Apelco marine adapter base. The mount is designed with a RAM 1" diameter patented rubber ball and socket system that has adjustment points at both ends of the double socket arm; thus allowing for almost infinite adjustment and perfect viewing angles.
4-Hole AMPS: 1.181" x 1.496"
Fishfinder Plate: 4.25" x 3.81"
Round Plate: 2.5" Diameter