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. Features: Gauge bar made of heavy gauge, chrome plated steel Adjusts to fit 20" to 29"+ wheels Replaceable threaded tip Upgraded, large inner shaft for added strength Tighter tolerances for improved accuracy Improved clearance and reach to fit more frame/hanger combos including low clearance thru axle derailleur hangers