The DAG-2.2 is an indispensable shop tool that can be used to both measure & straighten misaligned derailleur hangers, solving a high percentage of shifting problems Gauge bar made from heavy gauge, chrome plated steel Updated with tighter tolerances for enhanced accuracy Adjusts to fit 20 to 29+ wheels Upgraded, large inner shaft for added strength Replaceable 10mm x 1 threaded tip enhanced clearance & reach to work on more frame/derailleur hanger combos, including low clearance thru axle derailleur hangers Made in the USA & covered by Park Tools legendary limited lifetime warranty