1.25" to 1.875" Rail Clamp Base with D Size 2.25" Ball by Ram Mounts

The RAM-237, universal camera and camcorder base, consists of a 1.5" 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. The length of the thread is 1/4".