A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5910-01-061-1443
NSN 5950-00-975-7099
NSN 6105-01-439-2125
NSN 5999-00-836-0639
NSN 5855-01-112-7725
NSN 5990-00-446-0518
NSN 5999-01-401-5322
NSN 5925-01-347-5807
NSN 5985-01-310-9105
NSN 5999-00-883-0081
NSN 5950-01-117-5155
NSN 6110-00-343-1618