ARP Square Drive Harmonic Balancer, Damper Bolt Kit - SB Chevy R03P003XXL If you're looking for the

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ARP Square Drive Harmonic Balancer, Damper Bolt Kit - SB Chevy R03P003XXL If you're looking for theARP offers a special version of its rugged 200, 000 psi rated balancer bolt that can accept a standard 1 2? drive ratchet or breaker bar to facilitate rotating the crank assembly. 1 2? square drive forged into bolt head, enabling the rotation of an engine with any 1 2? drive tool Made from heat treated 8740 chrome moly steel with heavy duty black oxide finish. Since 1968, ARP is the fastener of champions and the world leader in fastener technology.