A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6110-00-496-9887
NSN 6650-00-862-7143
NSN 5945-01-023-8489
NSN 5965-00-990-8669
NSN 6220-00-229-1346
NSN 5835-01-237-3769
NSN 6135-00-412-1687
NSN 5930-00-907-7300
NSN 6105-00-538-8341
NSN 5855-00-058-1293
NSN 7035-00-585-2113
NSN 6320-01-624-0193