A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5998-01-623-4574
NSN 5990-01-328-8225
NSN 5855-00-014-5008
NSN 6240-00-551-3144
NSN 5999-01-328-7930
NSN 4140-01-608-4073
NSN 6650-01-449-3042
NSN 6130-01-441-2326
NSN 6130-00-589-9948
NSN 5910-01-429-0748
NSN 5960-01-323-3143
NSN 6320-01-116-3980