Description: 【Quality Material】The derailleur hanger alignment gauge tool is made of premium Aluminum Alloy, strong, durablity, sturdy and lightweight 【360° Rotation Correction】The bicycle derailleur hanger alignment gauge tool is with 360° rotation correction. Rotate the handle to lock the tail hook, making it easy to measure the distance between the wheel circle and the tail hook, ensuring accurate calibration and improving adjustment accuracy 【Main Functions】The bike alignment tool is used to correct the rear lug to solve many transmission shifting problems, especially the shifting system after positioning 【Suitable For】The bicycle derailleur hanger alignment gauge tool is in size 39.5cmx15.5cmx5cm/15.55inchx6.10inchx1.97inch, suitable for bicycles ranging from 12 to 29 inches and 650C/700C wheel diameters, sliding rod measuring distance reaches 270mm 【Repairing Tool】This professional bicycle derailleur hanger alignment gauge tool rear derailleur correction wrench is great for bike repairing, biking, riding, etc Specification: Material: Aluminum Alloy Size Chart: 39.5cmx15.5cmx5cm/15.55inchx6.10inchx1.97inch Package Includes: 1 Bicycle Derailleur Hanger Alignment Gauge