A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5996-00-264-8929
NSN 5920-01-231-3615
NSN 6240-00-209-1883
NSN 4140-01-218-5919
NSN 5930-01-330-2421
NSN 5945-01-592-2115
NSN 6135-01-518-8252
NSN 5905-01-258-5549
NSN 6645-01-083-4759
NSN 5945-00-419-2405
NSN 6110-01-426-6924
NSN 5945-01-503-6272