A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5965-01-349-7246
NSN 5975-00-567-2766
NSN 5975-00-851-6085
NSN 5895-01-576-4212
NSN 5998-01-634-0604
NSN 6135-01-164-3561
NSN 6145-01-010-9766
NSN 5835-01-010-3103
NSN 5945-01-436-7032
NSN 6130-00-654-5833
NSN 6610-00-468-1958
NSN 6150-00-470-7136