They've been re-tapped to accept standard ½-13" riser bolts, up from their original smallish 3/8-16" thread size.
While they were originally SUPPOSED to fit 1" bars, I found them to be somewhere between 7/8" & 1" --- which left an unacceptable gap when they were fully bolted down.
I've since run a honing/sanding stone through the handlebar center hole to bring them up to where they cleanly fit 1" handlebars.
I need $200 for these, which includes FREE shipping via USPS Priority Mail to anywhere in the lower 48 states.
If interested, have questions, or need more pics --- please PM me or email at: email@example.com