A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5920-01-629-1168
NSN 5915-01-272-9593
NSN 5950-01-130-6037
NSN 4140-01-242-0295
NSN 6110-00-643-4832
NSN 5960-01-399-4327
NSN 6650-01-127-9518
NSN 5996-00-472-2506
NSN 6110-01-420-4284
NSN 6110-01-409-2692
NSN 5990-00-554-0366
NSN 6645-00-295-0625