A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5990-00-394-3987
NSN 2925-01-391-1540
NSN 6320-01-358-0141
NSN 6220-00-172-3737
NSN 6320-01-388-3125
NSN 5905-01-421-6989
NSN 6645-00-403-6068
NSN 5999-01-049-4623
NSN 6240-00-933-7641
NSN 5935-01-173-6355
NSN 5996-00-880-5340
NSN 5920-00-196-0302