A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5920-00-815-5599
NSN 6320-01-381-7023
NSN 4140-00-554-8768
NSN 6610-00-489-9730
NSN 5975-00-891-8828
NSN 5990-00-170-4239
NSN 6220-01-316-9863
NSN 4140-00-179-3977
NSN 5975-01-527-8321
NSN 6240-01-047-4085
NSN 6685-01-376-1113
NSN 6145-01-323-4753