A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6650-00-434-0188
NSN 5960-01-388-1988
NSN 5965-00-163-9947
NSN 5935-01-374-9390
NSN 5996-01-571-1450
NSN 5960-01-029-4253
NSN 5925-01-328-0327
NSN 5999-01-529-7993
NSN 6685-01-490-6353
NSN 5915-00-565-0324
NSN 5950-01-650-6804
NSN 6130-01-050-9536