A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5835-00-104-8944
NSN 5920-01-025-2725
NSN 5999-01-303-7933
NSN 5996-01-462-1631
NSN 5945-01-507-4135
NSN 5935-01-254-5262
NSN 5925-01-099-0974
NSN 5930-01-142-2571
NSN 5925-01-422-0431
NSN 6650-00-955-2802
NSN 5930-01-250-3945
NSN 5965-00-045-7156