A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5945-01-227-2148
NSN 5935-01-651-5080
NSN 5996-01-013-8824
NSN 5855-00-481-0019
NSN 6645-01-159-5173
NSN 4140-01-396-7521
NSN 5910-01-571-7621
NSN 2925-01-424-0235
NSN 6650-00-955-2802
NSN 5895-01-025-5359
NSN 6110-00-012-2734
NSN 5915-01-503-6985