This part ships with the RAM-POD-I (RAM-316-1A). The female socket fits around a 0.5" dia. flex rod and uses a tightening screw to clamp the clevis in place. The other end of the post cap has a male Octagon Button that connects to the RAM female Octagon Button Arms.
Material: High Strength Composite
Note: The "U" in the part number reflects product packaged in poly bag.