Wheel Stud and Lug Nut Kit, 12MM X 1.5 X 3.25.509 Dia Knurl 12mm x 1.5 inch x 3.25 inch,.509 inch knurl for late model Corvette, Camaro and Firebird. Standard hole size.482 inch to.492 inch. Kit includes Moroso Part No. 46245 and Part No. 46345 for a total of 5 Wheel Studs and 5 Matching Lug Nuts.