The RAM-B-237, universal camera and camcorder base, consists of a 1" diameter rubber ball, connected to a 1/4"-20 camera thread. The male thread matches most standard camera and camcorder female threads found on the bottom of the camera.
RAM® Double Socket Arm with Diamond Plate
RAM® Double Socket Arm with Round Plate
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RAM® Twist-Lock™ Suction Cup Base with Double Socket Arm