A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5915-01-357-7585
NSN 6110-01-545-4911
NSN 5920-01-350-3163
NSN 6650-01-006-9593
NSN 5935-01-139-3657
NSN 5925-01-249-9066
NSN 6130-01-615-8976
NSN 6620-01-133-4193
NSN 5990-01-497-9249
NSN 2925-00-654-3206
NSN 6240-00-031-3112
NSN 6650-01-158-6888