A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5855-01-406-7237
NSN 5905-00-111-7965
NSN 5998-01-443-5423
NSN 6150-00-231-7431
NSN 5960-01-263-5777
NSN 5920-00-762-3348
NSN 5925-01-508-3209
NSN 5950-01-577-6368
NSN 6105-01-459-1002
NSN 5915-00-067-8906
NSN 5910-00-436-6234
NSN 5855-01-499-8692