Tanks introduces this great GM twist on gas cap with shallow cam. The gas cap is constructed out of steel and has a sharp zinc finish. The cap features a 1.00" overall height and a 2.33" outside diameter. Intended for use on some Tanks EFI fuel tanks. Steel construction. Zinc finish. 1.00" overall height. 2.33" outside diameter. For some Tanks EFI fuel tanks. Sold each.