A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6610-01-251-8860
NSN 5965-00-564-4399
NSN 6110-01-247-4192
NSN 6130-01-443-3761
NSN 6610-01-100-3662
NSN 6110-01-232-8554
NSN 5998-01-655-2505
NSN 6610-01-023-3220
NSN 7035-01-616-9565
NSN 5975-01-207-0508
NSN 5999-00-375-0180
NSN 7035-01-432-2424