M8 8mm Base to 3/8 Rocker Arm Screw In Stud Kit (2.000 Above Hex) Chevy GM LS
PCE arm stud kits are made of 4140 Chromoly steel. They're roll-threaded, heat-treated to a maximum strength of 190,000+ PSI. and have a black oxide corrosion-resistant finish. They feature larger radius stud fillets for extra strength.