A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6110-01-461-3612
NSN 6650-00-832-4679
NSN 6650-01-545-2834
NSN 6105-01-205-3787
NSN 5855-01-278-8922
NSN 5998-01-217-1372
NSN 6650-01-043-4221
NSN 5895-00-955-5569
NSN 5960-01-242-5297
NSN 5905-01-280-4593
NSN 6240-00-280-0186
NSN 5985-01-463-8475