RAM Mounts Universal Camera and Camcorder 1 Ball Base The Ram-B-202A, Rap-B-366, and Ram-B-237 universal camera and camcorder bases feature a 1 diameter rubber ball attached to a 1/4-20 camera thread. These bases include a round plate on the Ram-B-202A and Rap-B-366 models, which offer additional support and stability for cameras placed on top. The male 1/4-20 threaded steel stud allows for connection to any standard female thread commonly found on camcorders and digital cameras. Compatible Cameras: Any camera with a 1/4 - 20 thread Material: Amps Hole Pattern Base or No Base -Powder Coated Marine Grade Aluminum Plain Base - High Strength Composite Ball Size: 1 Rubber Ball B Size