CHEVY DURAMX DIESL HSK

Engine Compatibility: Chevy Duramax 6.6L,Nut Type: 12-Point,Finish: Black Oxide,Material: Chromoly Steel Better Fatigue Strength,Provide More Accurate And Consistent Torque,Premium Quality Heat-Treated 8740 Chrome Moly Steel Head Stud,Centerless Ground To Make It As Close To Perfectly Concentric As Possible,Limited 90 Day Warranty