Unior Hanger Genie 2.0 - Hanger Alignment ToolProduct Features: The Hanger Genie 2. 0 screws directly into rear derailleur hanger threads and features a precise measuring gauge that locks in place, ensuring you dont lose your measurement as you adjust the tool against the wheel in various positions. The rotating bottom part of the tool allows for easy clearance around the frame, making it an essential tool for any bike maintenance kit. Compact, foldable and highly accurate tool. Fits the bikes