ACDelco Multi-Purpose Bolt - 11508687 Part #: 11508687 Line: ACD ACDelco Multi-Purpose Bolt 1 Year Limited Warranty Material: Steel Thread Size: M8-1.25 Overall Length (in): 13/16 Inch Overall Length (mm): 20mm Head Size (in): 1/2 Inch Head Size (mm): 13mm Thread Diameter (in): 5/16 Inch Thread Diameter (mm): 8mm Bolt Grade: Grade 10.9 Color/Finish: Phosphate Show More Show Less