I bought a set of these last year -- look great but useless from day one.

10mm socket is over size
13mm socket is so oversize it rattles around on a new bolt head..

Just out of interest- what's a "flank drive socket"?

Cheers,

James

socket drives on the flats(flanks) of the nut not the corners see http://www.metrinch-tools.com/website/introductie.php?language=gb for better explanation and decent tools