New GM harmonic balancer bolt for LS engines (wet sump). Bolt should not be reused. For all LS based engines with a wet sump oiling system. Fits the following:

98-02 LS1 Camaro & Firebird/Trans Am
97-12 LS1/LS6/LS2/LS3 Corvette (Not for LS7/LS9)
04-06 LS1/LS2 GTO
04-07 LS2/LS6 CTS-V
99-12 4.8L/5.3L/6.0L GM Gas Sierra/Silverado