A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5895-01-447-3530
NSN 2925-00-614-1758
NSN 6650-00-231-7843
NSN 5998-01-123-8126
NSN 6685-01-521-3950
NSN 6685-01-281-9525
NSN 5990-00-578-8850
NSN 5975-01-176-2056
NSN 6145-01-366-5902
NSN 5930-01-378-5454
NSN 5945-00-596-2665
NSN 6135-00-735-8530