Dorman AutoGrade Spring Center Bolt - 660-033 Part #: 660-033 Line: DOR Dorman AutoGrade Spring Center Bolt Limited Lifetime Warranty Diameter (in): 1/2 Inch Material: Carbon Steel Thread Size: 1/2-20 Inch Length (in): 12 Inch Head Type: Slotted SAE Or Metric: SAE Hex Size: 5/8 Inch Color/Finish: Black, Zinc-Plated Heat Hardened: Yes Integrated Washer: No Show More Show Less