Park Tool DAG-3 Derailleur Hanger Alignment Gauge

Park Tool Derailleur Alignment Gauge and straighenner for keeping drive train in correct alignment.

• Compatible with 16" to 29"+ wheels (ISO/ETRTO rim sizes from 317 to 630+)
• Replaceable M10 threaded tip
• Low-profile head fits low clearance thru-axle derailleur hangers and Shimano® Direct Mount hangers
• Length: 16.5” (420mm)
• Weight: 22.75 oz. (645g)