A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5855-01-407-3739
NSN 6220-00-217-9149
NSN 6320-01-349-5515
NSN 5965-01-372-3593
NSN 7035-00-631-3782
NSN 5990-01-036-8080
NSN 6105-00-059-9166
NSN 5998-00-254-8447
NSN 5999-01-139-0781
NSN 6135-01-572-8530
NSN 5915-01-263-9052
NSN 6105-00-838-1323