The HAG is the last hanger tool you'll ever have to buy. - Tolerances as tight as a quarter of a thousandth of an inch (.0063mm) in some critical dimensions of this tool. - Ability to lock in the feeler so you don't have to second guess your measurement after bumping it on the tire. T - Top half of tool will rotate out of the way of fender stays and frame tubes. - Feeler gauge stick stores inside the top half of the tool, very handy for the traveling mechanic. - T bolt extends past the tool for access to those problematic hangers found on some modern full suspension bikes. - Compact at just under 11" ( 28cm). - Re-buildable. While ideally your HAG should be sent back for a rebuild, it is possible to do them in the field by replacing the brass bushing in the T-Bolt. - Compatible with the three most common wheel sizes, 26, 27.5, 29.