A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6650-00-330-0108
NSN 6610-01-099-0303
NSN 5985-01-299-9258
NSN 5930-01-256-5531
NSN 5920-01-065-1824
NSN 5930-01-648-7124
NSN 6610-00-191-5317
NSN 6150-01-281-2131
NSN 6620-01-051-2045
NSN 5905-00-549-9130
NSN 5990-01-264-9759
NSN 5998-01-468-0069