A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5935-01-627-3420
NSN 5950-01-481-2579
NSN 5985-01-364-0040
NSN 5965-01-492-5695
NSN 6150-01-359-7405
NSN 5945-00-892-1116
NSN 5960-01-473-9203
NSN 5990-01-261-2962
NSN 6240-01-242-9138
NSN 5999-01-622-1069
NSN 6645-00-467-6094
NSN 4140-00-099-1716