A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5998-00-738-7510
NSN 6610-00-450-4875
NSN 7035-00-200-5162
NSN 5999-01-381-7465
NSN 6685-00-896-0009
NSN 5990-01-500-5412
NSN 5975-01-390-7893
NSN 5996-01-579-4849
NSN 5905-01-044-5606
NSN 5996-00-844-6227
NSN 5975-01-328-6737
NSN 5930-01-509-4907