This kit is a Grade 8 Stainless Steel ARP (American Racing Products) bellhousing bolt kit for the Mopar Big Block engines. Use these to bolt your 727 trans to the engine. 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. This kit also includes stainless washers.