Engine Pro Shouldered Screw in rocker studs for Chevy Small Block 8740 Chromemoly Steel induction heat treated and black oxide coated. Rated at 190,000 lb. tensile strength.Base Thread 7/16" .680" LengthUpper Thread 7/16"Effective Stud Length 1.750" In an effort to reduce the occurrence of "Porch Piracy", please consider changing your shipping address to a commercial address if no one is at home for delivery. The shipping companies are not responsible for missing shipments once an item is marked "delivered". Thank you.