9steel; case harnened; 2.160 in. Lg; 1.120 in. Od head; 0.400 in. Head lg; 0.685 in. Od collar; 0.940 in. Lg collar; 0.498 in. Diameter stem; 0.820 in. Lg stem; 0.410 in. W by 0.075 in. Deep notch on 1 side ofcollar; notch located 0.100 lg from collar end