A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6320-01-018-7073
NSN 5975-01-094-6943
NSN 5998-00-176-8493
NSN 6110-01-258-6220
NSN 5925-00-896-4847
NSN 7035-01-524-0014
NSN 5935-01-502-2737
NSN 6105-01-015-0827
NSN 5990-01-320-1412
NSN 6105-01-563-1961
NSN 6145-00-156-4394
NSN 5905-00-190-5844