The Clutches and Brakes The STIEBER F8(RSCI-90) Cover is an essential replacement component designed specifically for the RSCI-90 series of clutches. This high-quality cover ensures optimal performance and longevity in mechanical systems that rely on STIEBER's renowned overrunning clutches and backstops. Engineered with precision and built from durable materials, the F8(RSCI-90) cover enhances the reliability of your drive systems.