This kit is a Grade 8 Stainless Steel ARP (American Racing Products) bellhousing bolt kit for the Olds Rocket engines. Use these to bolt your trans to the block. These are not only good looking, and don’t rust, but they are super strong and have a polished finish on them. These bolts have a tensile strength of 170,000 psi. They have a 1/2 inch 6 point head and a .750 diameter flange for easier access in the tight spots. This kit also includes 7/16 stainless AN washers.