Emergency derailleur hanger is designed to temporarily replace a hanger that is damaged or broken on a ride. Anchored in place by the rear quick-release it allows the use of most gears, and more importantly, for the bike to be ridden instead of pushed or carried. - Fits most frames that use a quick-release rear hub - Provides nearly complete shifting range - CNC machined 6061 aluminum - Black anodized finish - Made in the USA