ATI Harmonic Balancer Bolt Kits #950217.

Harmonic Balancer Bolts, Internal Allen, Chromoly, Black Oxide, 5/16 in. Thread, 1.00 in. UHL, Chevy, Set of 9. Thread Size:5/16 in.-24

ATI harmonic balancer bolt kits are comprised of extra-strength chromoly steel bolts that can be used with ATI and other popular dampers. The kits are designed for the balancer to crank attachment to secure the balancer in place and keep it there, even under severe conditions.