The THRASHIN SUPPLY CO. Custom Billet Derby Cover is a precision‑engineered aluminum component designed for primary‑drive and cover applications on street‑oriented machines. Finished in a high‑gloss polished surface, the classic‑style cover features a three‑hole mounting pattern that aligns with standard derby‑type assemblies, delivering a clean, bolt‑on fit without the need for additional modifications.
Constructed from billet aluminum, the cover offers a lightweight yet robust solution that resists corrosion while maintaining structural integrity under the rigors of street riding. Each unit ships with a matching gasket, ensuring a sealed interface that protects internal components from contaminants and helps preserve optimal drivetrain performance.