A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6645-00-927-1444
NSN 5895-00-900-8200
NSN 5895-00-734-5401
NSN 5935-01-508-8426
NSN 6105-01-609-1144
NSN 5950-01-599-9451
NSN 5996-01-270-2932
NSN 6135-00-715-4001
NSN 4140-01-426-3171
NSN 5920-01-185-9361
NSN 5915-01-017-8681
NSN 5835-00-928-5717