A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6645-00-876-4413
NSN 6645-01-308-9349
NSN 5925-01-367-5585
NSN 6105-01-414-1531
NSN 6135-01-317-6021
NSN 5920-01-423-0805
NSN 4140-01-433-1192
NSN 6320-01-397-9995
NSN 5895-00-334-0142
NSN 6145-01-461-8062
NSN 5998-01-360-5516
NSN 5960-01-264-2087