A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5975-00-902-1420
NSN 5965-01-277-4161
NSN 5895-01-521-1746
NSN 6645-01-483-1518
NSN 5985-01-090-0098
NSN 6645-00-226-2270
NSN 6135-00-932-3136
NSN 7035-01-508-2541
NSN 6105-01-261-3046
NSN 6150-01-132-4287
NSN 4140-01-281-0222
NSN 5835-01-063-6284