Description:Professional Bike Frame Derailleur Hanger Alignment Gauge that can measure and straighten the misaligned transmission hanger, solving most of the shifting problems.Strong and durable,Improve performance, to work on more frame/derailleur hanger combos.Wheel replaceable threaded tip is improved after the large inner axle increases the resistance tolerance more strictly, improves the clearance accuracy and the extension range improved to fit more frame / handlebar combinations, including small clearance through the shaft transmission hanger.For variable lug calibration for many speed variations, especially for post-position variable speed systems. An essential tool for cycling enthusiasts.Made of aluminum alloy and stainless steel, durable and practical.Specification:Material: Aluminum Alloy + Stainless SteelSize Chart:Length: 430mm/16.93inchPackage Includes:1 Piece Bicycle Derailleur Hanger Alignment Gauge