This kit is a Grade 8 Stainless Steel ARP (American Racing Products) valve cover bolt kit for the Chevy V-6 engines. These bolts are for center bolt valve covers. They are not only good looking, and don't rust, but they are super strong for your high horsepower needs and have a polished finish. These bolts have a tensile strength of 170,000 psi. They have a 5/16 inch 6 point head and a .560 diameter flange for easier access in the tight spots. This kit also includes stainless washers.