A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5835-01-257-0154
NSN 5945-01-412-1393
NSN 6650-00-101-0559
NSN 6240-01-203-0392
NSN 5990-00-481-0787
NSN 5998-01-218-0851
NSN 2925-01-014-0118
NSN 5998-01-544-6181
NSN 2925-00-373-8837
NSN 5925-01-266-1093
NSN 5945-00-273-9481
NSN 6110-01-446-6296