GM 7/16 ARP Front Mandrel Drive Bolt # 330-0701 Front Mandrel Bolt, 12-Point, GM, 7/16" Diameter, 6.000 Length, 1/2" Socket Underhead Length (in):6.000 in. Fastener Head Style:12-point Thread Length:1.100 in. Fastener Yield Strength (psi):200,000 psi Fastener Material:8740 chromoly Fastener Finish:Natural Wrench Diameter:1/2 in. Quantity:Sold individually. These ARP front mandrel drive bolts feature extended lengths specifically designed for your front drive mandrels. They are manufactured from ARP's high-strength 8740 chromoly steel and have a shot-peened finish for extra durability. The bolts are undercut to provide the necessary extra stretch and are designed for full thread engagement.