Ford Barra 12mm Head Stud Kit – PlazmamanFord Falcon Barra XR6 BA BF FG FGX 4. 0L 6 Cyl 12 Point Head Stud Kit This is a Full set of heavy duty cylinder head fasteners, and are made from aircraft quality 8740 high tensile strength chromoly steel and cold forged to ensure molecular integrity. They are heat treated prior to thread rolling and machining and are rated at a whopping 190,000 psi. All kits come complete with 12 point nuts and hardened parallel washers for an even load distribution