A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6105-00-189-0515
NSN 5950-00-127-0744
NSN 5998-00-946-7998
NSN 6650-01-066-9792
NSN 5945-00-862-3979
NSN 5965-01-032-7236
NSN 6240-00-054-6540
NSN 5925-00-249-1287
NSN 5975-01-134-2043
NSN 5999-01-557-9638
NSN 5835-01-200-5069
NSN 5905-00-168-1586