Roll Point Catch measures 3/8" in diameter is referred to as a catch bullet or pivot pin on earlier diagrams. Two of the roll point catches are used on the bottom step (one on each side) to stop the lower hinge arm from over extending while folding the step in.
See parts manuals for compatibility and placement.
Compatibility: 1977 to Present Airstream
To view an interactive image of the Airstream Aluminum Double Step Assembly Parts Diagram click here.