A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 7035-01-386-3004
NSN 7035-00-541-8516
NSN 6240-01-210-0164
NSN 6105-01-232-0891
NSN 5990-00-236-8152
NSN 4140-01-585-7827
NSN 5945-01-265-3985
NSN 5996-00-765-1401
NSN 6110-01-509-4444
NSN 6150-01-580-4315
NSN 5945-01-467-8045
NSN 5999-00-150-8792