A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5999-01-394-2190
NSN 5920-01-231-8520
NSN 5945-01-211-6585
NSN 4140-01-564-8930
NSN 6610-00-546-4763
NSN 5855-01-533-0996
NSN 6650-01-660-7687
NSN 6135-01-609-3628
NSN 6145-01-059-8365
NSN 5950-00-385-1686
NSN 7035-01-416-5910
NSN 5910-01-491-0861