Timeless exclusive , We had these made up so there is Lots of metal 3/8" diameter and you can use a substantial Allen wrench ( 3/16" ) threads are 10-32" nf
Offers 1/2" length of threading, about 15 turns.
The diameter can be turned down to 5/16" as an option, so it fits under the top with more clearance. ( $10.00)