Part No. 204-4706 - includes a set of ten ARP2000 head studs, ten parallel ground washers, ten 8740 chrome-moly steel 12 pt nuts and a 1/2 oz. pack of ARP Ultra-Torque fastener assembly lubricant. All Pro Series ARP2000 studs are centerless ground, heat treated prior to thread rolling and machining, and are nominally rated at 220,000 psi. These fasteners deliver a 45% increase in tensile strength over the OEM Torque To Yield (TTY) head bolts.