A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5975-00-847-8850
NSN 5975-01-229-7155
NSN 6220-01-359-5296
NSN 5950-01-182-2550
NSN 5960-01-223-1203
NSN 4140-00-082-8228
NSN 5905-01-556-9578
NSN 5998-01-358-4667
NSN 6135-01-464-2075
NSN 5960-01-361-6543
NSN 6610-01-250-2811
NSN 5915-01-575-4832