A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6110-01-531-3896
NSN 5965-01-231-9125
NSN 4140-01-029-8252
NSN 5855-01-510-9416
NSN 6150-01-457-4142
NSN 6320-01-078-8257
NSN 6105-00-823-4451
NSN 5910-00-528-4311
NSN 6145-00-377-0971
NSN 5835-00-327-6192
NSN 6135-00-577-8429
NSN 5925-01-418-2872