A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6610-01-112-0447
NSN 6320-00-213-0477
NSN 7035-01-290-1447
NSN 2925-01-069-5324
NSN 5950-00-730-4105
NSN 5990-00-212-4316
NSN 6130-01-505-6558
NSN 5935-00-683-7894
NSN 5835-00-074-3700
NSN 6130-01-222-3925
NSN 5999-00-828-0533
NSN 5935-00-900-4104