A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5930-01-571-9616
NSN 5895-00-982-6050
NSN 5920-00-989-0874
NSN 5835-01-426-5489
NSN 6240-00-580-0666
NSN 6610-00-256-8006
NSN 5990-01-094-7740
NSN 5910-00-422-5333
NSN 5965-00-199-4456
NSN 5935-01-602-9082
NSN 5996-01-100-2377
NSN 6320-00-343-1798