A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5985-00-891-2423
NSN 6650-00-137-3845
NSN 5990-01-133-0351
NSN 5945-01-530-5296
NSN 6645-00-308-4179
NSN 5910-00-472-3237
NSN 5960-01-305-1874
NSN 6135-01-543-9363
NSN 5905-00-035-8981
NSN 6105-01-398-1674
NSN 6110-01-223-5973
NSN 6650-01-434-6434