A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5975-01-370-3979
NSN 5985-00-496-8914
NSN 5950-00-295-3034
NSN 6610-00-110-9455
NSN 6645-01-436-4542
NSN 6685-00-422-8573
NSN 5999-00-515-7354
NSN 7035-01-183-7550
NSN 6220-01-467-9608
NSN 6110-01-592-1663
NSN 5998-01-642-4624
NSN 5910-01-574-0303