A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5999-01-379-6908
NSN 5855-01-452-1406
NSN 6145-01-227-0659
NSN 5915-01-146-0190
NSN 5945-01-441-6458
NSN 6645-01-381-6084
NSN 6685-01-592-1594
NSN 5999-01-228-0744
NSN 6620-01-578-7561
NSN 5895-01-020-0154
NSN 6220-01-092-4533
NSN 5975-01-076-3656