A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6620-01-401-5356
NSN 5965-01-459-2273
NSN 6240-01-188-5280
NSN 5975-00-805-1485
NSN 6610-01-555-6654
NSN 5950-01-323-6674
NSN 6130-01-185-3042
NSN 5910-01-489-5550
NSN 6110-00-185-8147
NSN 5945-00-957-7217
NSN 6650-00-955-2802
NSN 6135-01-391-6515