A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6220-00-947-0265
NSN 5935-01-062-0705
NSN 6650-01-525-7370
NSN 6105-00-837-6270
NSN 6150-01-527-4661
NSN 5935-01-589-0188
NSN 6650-01-454-0684
NSN 6610-01-196-6388
NSN 6105-01-642-9581
NSN 2925-01-604-8984
NSN 5920-00-019-0259
NSN 5965-01-575-9433