1 inch Ball Camera Base with 1/4 inch -20 Threaded Stud The RAM-B-237, universal camera and camcorder base consists of a 1 inch 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. Material: Powder Coated Marine Grade Aluminium Ball Size: 1 inch Rubber Ball inch B inch Size