Obvious typo,
.098" not .98"
1/10" not 1"
I don't know what they are advertised as, I just measured mine and reported my results.
I have both the FO and the "file fit" black front sight, the ones meant to be used with the comp rear sight.
I can't decide which I like better, the FO is quicker to aquire and works well for USPSA, but the black gives me a more precise picture which has worked better for me in steel plate matches.