that doesnt matter its a wedge so as you tighten it it expands
and a bike fork and handle bars are the same thing both a are tubing a bike fork is 1 1/8 just a regular tube welded to the fork legs and stock bars are 1 1/8 the same exact thing as a bike fork nothing specail about either of them, the wedge also has the little dimples on the out side to give it more grip, so pretty much its a easy to remove starnut you just dont know what size bolt threads into it