Mr. Gasket Metric header bolts are manufactured from high quality carbon steel-8mm-1.25 x 25mm and come in two convenient sets. The compact hex head and flange design is ideal for use where space is minimal, typical on header flanges. The black oxide finish resists corrosion and provides a clean professional appearance. Fits GM LS and LSX Series 1997-up, 4.8L, 5.3L ,5.7L, 6.0L, 6.2L, and 7.0L engines. 12 bolts per set.