When installing headers you will need header bolts, factory exhaust manifold bolts won't work. These Aeroflow header bolts are made from Grade 8 steel for strength. They are coated in a black oxide for protection and long-lasting durability. Each hex head is designed to take a 7/16" spanner size. This compact hex head is ideal for use where space is minimal on most aftermarket header flanges.
 
Sold as a set of 12.
Thread size : 3/8-16"
Overall Length : 34.7mm
Under Head Length : 25mm