Exhaust Hardware Exhaust Manifold Stud Bolt Grade:10.9 Dog Point Fastener:Yes End Stud Thread Diameter:0.309 In. End Stud Thread Length:1.5 In. End Stud Thread Type:Fine Item Grade:Standard Replacement Length:3.25 In. Material:Steel Nut Color:Silver Nut Material:Steel Package Contents:4 Studs, 5 Bolts and 4 Nuts Pilot Point Fastener:Yes Spring Included:No Stud Color:Black Stud Grade:10.9 Stud Length:3.25 In. Stud Material:Steel Thread Size #1:M8-1.25 Thread Size #2:M8x1.25 Washer Included:No