These Pro series bolts and nuts from ARP are cold-forged to ensure molecular integrity for MGB's with the 18GG through 18V engines using straight-on, NOT angled, connecting rod caps. They are heat-treated prior to thread rolling and machining and are rated at 190,000 psi. The Pro series kit has 12-point nuts, and comes complete with hardened parallel washers for an even load distribution and accurate torque readings. 11/32" , fits non S 1300cc Mini.