The Keys RC KRMX06 Aluminum Chain Tension Adjuster Set is designed specifically for the Losi Promoto MX model, offering a 1:4 scale compatibility for cars, trucks, and motorcycles. This set, featuring the brand Keys RC, provides easy adjustment for optimal chain tension, enhancing performance and control during RC racing experiences. Ideal for hobbyists looking to upgrade their vehicles' drivetrain components, this set ensures smooth operation and precise adjustments for improved handling.