− Decrease quantity for Bolt, Harmonic Damper Hardware, Hex Head, 3/4 in. Thread Size, 3 in., Grade 8 Steel, Zinc Plated, Mopar, Each Quantity + Increase quantity for Bolt, Harmonic Damper Hardware, Hex Head, 3/4 in. Thread Size, 3 in., Grade 8 Steel, Zinc Plated, Mopar, Each Add to cart