Essential Bicycle Maintenance Tools - The for ZTTO Road Bike Shifter Tool Set includes a Derailleur Hanger Alignment Gauge and a Shifter Height Angle Adjuster. Crafted from durable aluminum alloy, this tool set is indispensable for ensuring optimal performance of your bike's shifting system. Includes an adapter nut compatible with all market brands of tail hook straighteners. Functionality: Use the gauge to measure and straighten misaligned derailleur hangers, enhancing shifting accuracy, especially with index shifting systems. The tool threads directly into the derailleur hanger, with a gauge bar that holds a marker to measure the distance to the wheel at various positions. Adjustments are made by applying pressure to the tool's arm, with instant results. Design Enhancements: Features an upgraded large inner shaft for increased strength, tighter tolerances for improved accuracy, and enhanced clearance and reach to accommodate more frame/hanger combinations, including those with low clearance thru-axle derailleur hangers. Colour:Black Material:Aluminum Alloy Package Contents: 1 * straightening rod 1 * measuring rod 1 * inner shaft 1 * locking screws 1 * protective cover