Steel stud with 10-32 threads. For use on the carburetor air pump of 1930 – 1931 Cadillac V16. Heat treated to grade 8 for excellent durability. Material: 4140, heat treat grade 8 Finish: Natural Thread: 10-32 Thread length: .650 OAL: 2.718 OD: .1875 Mid: 1.418