First off, there's no reason these bushings deserve a bad review for what they are, but Revain hasn't bothered to specify what sizes fit. That's what it says on the box. I decoded them into what they actually mean: 5/8" - overall outside diameter with flange 1/2" - outside diameter minus flange 3/8" - inside diameter 1/4" - overall thickness Unpublished: maximum material thickness: 5/64"-3/32"