A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 4140-01-120-9477
NSN 7035-01-537-0408
NSN 6110-00-421-3549
NSN 5910-00-391-6304
NSN 5960-00-759-9463
NSN 5945-01-619-8149
NSN 5996-00-484-9196
NSN 5960-01-271-7239
NSN 2925-00-060-8292
NSN 6610-01-376-9199
NSN 5950-01-535-7276
NSN 5999-01-349-0870