ARP 2084302 12-Point Cylinder Head Stud Nuts<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>12 Point Nuts w/Under Cut Studs</li><li>Stud Is Placed Vertically In Special Racks And Precisely Heat Treated To 200，000 PSI</li><li>Centerless Ground To Make It As Close To Perfectly Concentric As Possible</li><li>Thread Rolled After Heat Treat， Which Gives Them About Ten Times Better Fatigue Strength Than Those Studs That Are Threaded Prior To Heat Treat</li><li>Uses A Premium Grade 8740 Alloy That Is Rated Far Superior To Aircraft Quality</li></ul></div><img src="http://ecx.images-amazon.com/images/I/317WCMD9M1L.jpg" noproxy>