This Kit made by ARP has the 2000 grade material used in its construction. The kit is a direct installation to replace the original main cap bolts in to the 5.0 lt Coyote supercharged engine fitted to either the FG GS or FG GT. The kit comes with inner & outer studs with nuts / washers and is also supplied with a full set of cross bolts. Each kit includes ARP assembly lube. Pic for illustration purpose only. 00046967