Toopre - Professional Bike Derailleur Hanger Alignment Gauge Tool for Road and MTB Bikes | Repair and Precise Adjustment Material: High quality aluminum alloy Weight: Approx. 393 g The Toopre derailleur hanger alignment gauge is a must-have professional tool for any workshop or DIY enthusiast. Ideal for both measuring and straightening misaligned derailleur hangers, this tool allows you to accurately fix one of the most common causes of shifting problems. Compatible with most road and mountain bikes (MTB) Solid aluminum alloy construction: strong, durable and lightweight Easy to use: improves derailleur alignment and optimizes drivetrain performance Perfect for cyclists, mechanics and specialist workshops, the Toopre gauge ensures precise derailleur alignment for smooth and reliable shifting every time.