Up for bids we have a Bil-Jax # BJ-36 leveling jack for scaffolding. It measures 24" tall. The base measures 6" x 6". The stem at the top measures around 1.365-1.370 with dial calipers. I would say this would be for a 1 3/8" I.D. It is used and has some rust but is still in good working condition. Thanks for looking.