C.A.T. chrome moly steel roller tip rockers are manufactured from cold stamp processing. Deep carbonization to HRC60 creates tough core and case properties, providing the best hard and wear resistance of any other supplier. The 4340 roller tip rockers are long slot for high lift cams and stand valve spring pressure up to 350 PSI. 16 self-locking nuts and metal powder pivot balls are packed together with 16 rockers. Self-align feature is available for SBC and SBF.