Bi-directional clutch full convex engagement design for smooth maximum surface engagement (engagement surface area more then 2, 3 or 4 shoe clutch on the market), using new quick engage 2 oval springs design allow high power transfer Maximum power transfer. Bi-directional design allow full convex engagement CNC machined to exact tolerances Precision balanced no steel pin are added. 2-spring system for today higher power 2.8 engine. Power up Bi-directional 7075 clutch shoes. EZ installation with no special Tool.