The RAP-B-379U-M616 consists of a 1" diameter rubber ball, connected to a M6-1 X 6MM male threaded post.
U.S. Standard Thread Diameter and Pitch Option:M6-1 x 6mm
Material:High Strength Composite & Steel
1" Rubber Ball "B" Size
The "U" in the part number reflects product packaged in poly bag.
Weight Capacity:2 lbs.