ATI Crank Hub & Inner Shell Steel - BBC w/1/4 Keyway 931011 With seven layers of progressively

With seven layers of progressively finer mesh cotton gauze/synthetic media between 100-percent polyurethane top and base

Precision rolled threads prevent galling while promoting more consistent torque loading

All adjusters are constructed of Ultra-Light aircraft quality material

Studs have a nut-starter radius to prevent cross-threading / and available in polished stainless steel or black oxidized chromemoly

ATI Crank Hub & Inner Shell Steel - BBC w/1/4 Keyway 931011 With seven layers of progressivelyProduct Description: Harmonic Balancer Hub Inner Shell Steel Black Oxide ATI Balancers Big Block Chevy Sold Individually ATI Performance Products is a company founded on innovation, precision and service. ATI harmonic Super Dampers add horsepower and torque to race, street and truck engines. ATI Performance Products is the creation of over 40 years of Transmission and performance component manufacturing and racing experience.