The DAG-2.2 is an indispensable shop tool that can be used to both measure and 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 improved accuracy. Adjusts to fit 20" to 29"+ wheels . Upgraded, large inner shaft for added strength. Replaceable 10mm x 1 threaded tip. Improved clearance and reach to work on more frame/derailleur hanger combos, including low clearance thru axle derailleur hangers. Made in the USA and covered by Park Tool's legendary limited lifetime warranty.