The RAP-B-379U-252037 consists of a 1" diameter rubber ball, connected to a 1/4"-20 X .375" male threaded post. The male thread matches most standard camera and camcorder female threads found on the bottom of the camera.
Specifications
U.S. Standard Thread Diameter and Pitch Option: 1/4"-20 X .375"
Material: High Strength Composite & Steel
Ball Size: B Size 1" Rubber Ball
Note: The "U" in the part number reflects product packaged in poly bag.