A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5985-00-291-9974
NSN 6240-01-599-2679
NSN 6240-01-244-0709
NSN 5965-00-362-2158
NSN 6150-00-554-7591
NSN 5990-01-336-3976
NSN 5895-00-604-8732
NSN 5895-01-049-0849
NSN 6110-00-288-4179
NSN 5905-01-280-5449
NSN 5975-00-719-9793
NSN 6130-01-397-4845