With \'balls\' lock-up pressure plate. Complete clutch pack that will fit the OEM clutch basket. Offers over 60% more friction area than the stock clutch. The \'Balls Pressure Plate\' incorporates 42 steel balls that, by way of centrifugal force, will aid clutch springs in pressure. More RPM = more pressure for great clutch hold with Big Inch motors, but still giving a significantly lighter pull at the clutch lever. Note: For replacement parts see 518955 for the Aramid friction plate set (7), 518954 for a .120\" steel drive plate (1) and 518987 for .059\" steel drive plate set (6).