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5" diameter base with the universal AMPS hole pattern and round base with a 1/4"-20 threaded steel stud
The RAM antenna mount will work with any standard antenna that has a 1/2" NPT male interface
With two C size 1
The RAM-B-103-A-238CHU consists of a CHROME diamond base and SHORT double socket arm that will accept 1" ball bases
diamond base and connecting Humminbird/Apelco marine base
RAM® Yoke Clamp Base with Ball RAM-111U 5" diameter base with theThe yoke clamp base will fit rails in diameter from 0. 625" to a maximum of 1. 25". The 1" rubber ball is at a right angle to the plane of the mount; when connected to a rail, the ball sits parallel to the rail.