Quarter Master Optimum-RR Clutch kits are exactly what you need for your high-performance race vehicle. Designed to fulfill the wishes of every weekend racer, the Optimum-RR kits features Optimum-RR Two-Disc Clutch with a fully rebuildable cover optimized for strength without compromising weight or moment-of-inertia. Kits also utilize the latest hardened steel pinned cover leg, with .250″ thick friction material that allows for quick, smooth shifts. Replacing the troublesome stock release bearing, this kit includes an ultra-reliable Tri-Lite Hydraulic Release Bearing with an adapter that mates to the existing bellhousing and inlet and bleeder lines.