Reduces grabbing and gives smoother shifting and longer clutch life. This is designed to adjust the clutch basket end play to a minimum, leaving room for the discs to spin freely, which prevents the basket from forcing the spinning discs together when the clutch is disengaged, thus stopping the effect of clutch basket walk out with the clutch disengaged. If you have ever felt your bike lunge forward at a stop light for no apparent reason, this is why. When used with the “Solution” clutch hub bearing kit and clutch hub liner kit, you will upgrade your clutch assembly by 50 years. Fits 1941-(Early)1984 Harley Knucklehead, Panhead & Shovelhead Big Twin Models with a 10-Spring Clutch & 5 Long Adjustment Studs. (Fits models with belt or chain drive primaries)