Knurled seatpost binder bolt for framers with recess is seat lug eaars
used and functional with very little surface rust
21MM COMPLETELY CLOSED, THE MALE THREAD PORTION IS 12.5MM to give you an idea, also actually diameter of middle is 7.6 and the knurled part is 10.8 diameter
Not keyed but knurled to fit frames with recess for head, THE INSIDE FLATS ARE NOT ROUNDED, ITS LIKE 20 PT SOCKET VS 8
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