Park Tool Derailleur Hanger Alignment Gauge 2.2 DAG-2.2

- Ensures rear derailleur hanger is parallel to wheel \n- Mounts to hanger and measures distance to wheel\n- Gauge arm also functions as cold set correction tool \n- Chrome-plated steel construction\n- Fits 20" to 29"+ wheels \n- Improved clearance and reach works on more frame/derailleur hanger combos, including low clearance thru axle derailleur hangers\n- Retailers are not permitted to sell on the Amazon.com marketplace unless authorized in writing by Park Tool