A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 2925-01-055-9705
NSN 5998-01-634-0604
NSN 6645-01-450-5175
NSN 5996-01-146-9481
NSN 5990-00-321-8459
NSN 5999-01-058-2832
NSN 6150-01-122-0546
NSN 5999-01-468-5665
NSN 5998-01-103-3415
NSN 6620-00-467-7414
NSN 5960-01-467-0961
NSN 5945-00-619-3553