A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5945-01-542-9117
NSN 6685-01-386-3110
NSN 5965-01-429-0881
NSN 6645-01-062-0905
NSN 4140-01-142-1225
NSN 6130-01-342-1441
NSN 5996-01-350-7147
NSN 6150-00-421-4197
NSN 5925-00-108-5385
NSN 5999-01-568-5824
NSN 5930-01-380-5611
NSN 6685-01-541-7243