Enhanced Riding Experience: Upgrade your bike with our 21-speed derailleur and shifter set, designed for optimal performance in mountain biking and trekking.Construction: Crafted from high-quality materials, our bike derailleur and shifter set withstands rigorous use in diverse terrains. The robust mechanism ensures long-lasting reliability and performance.Complete Kit: Each package comes with a full set of shift levers, brake system, and a shift cable, providing everything you need for a quick setup and go. Ideal for DIY enthusiasts and professional cyclists alike.Universal Fit: Designed to fit most mountain bikes, this versatile set enhances your control and efficiency, making it a perfect choice for both casual rides and competitive events.Color: As ShownMaterial: Aluminum AlloyPackage Contents:2 x Cycling Disc HandleOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.