Stern-mounted boarding ladder from a sailboat.
Stainless steel tubing is somewhat less than 1" in diameter.
Was mounted with pins, able to pivot out of the water for storage.
Mounts are still on the boat, but could be retrieved if desired.
Standoffs hold the ladder a little away from the stern.
16 inches between the sides, mounting pins would be spaced this far apart.
33 inches between the top and bottom steps.