• High–Quality Material :Crafted from sturdy materials, this bicycle derailleur guarantees long–lasting performance and reliability • Versatile Compatibility :Designed for compatibility with 3, 7, 8, 21, and 24 speed bikes, it presents versatility and convenience for different cycling wishes • Integrated Brake System :Equipped with an incorporated brake system, it presents enhanced security and control during your trip • Easy Shifting :The shifter lever allows for delicate and easy shifting, modifying your cycling experience • Professional Design :Its legit design makes it suitable for mountain bikes, offering optimum functionality on demanding terrains • Efficient Performance :With its efficient performance, this bicycle derailleur guarantees brief and precise shifting, editing your cycling performance ☛Left hand handles 3 shift selector, and appropriate hand handle seven shift shifter,easy to adjust velocity ☛Practice in use: the visible tools position show make sure the gear replace is clear at a glance ☛Speed governor: 21 pace mountain bike variable pace governor transmission one–piece brake ☛Ergonomic design: 3x7 speed shift brake manage gives an ergonomically designed finger function and trigger–style manage ☛Wide application: appropriate for MTB,city car, leisure vehicle, avenue car, folding and so on Specification: Item type: Bicycle shifter brake Color: Black Material: Aluminum Alloy The internal diameter of the manage mounting holes: About 22 Applicable: MTB,city car,recreational vehicle,road car,folding