A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 2925-00-343-3235
NSN 5990-01-485-0260
NSN 5990-01-235-8404
NSN 6145-01-235-3263
NSN 5895-01-653-6438
NSN 4140-01-004-3035
NSN 5960-01-544-1273
NSN 5965-01-469-7401
NSN 6145-00-408-1724
NSN 2925-01-545-2717
NSN 5999-00-544-2767
NSN 5950-01-586-7284