A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5835-00-813-1724
NSN 5910-00-603-4290
NSN 5910-00-790-3789
NSN 5985-01-424-5689
NSN 5990-01-100-7231
NSN 5930-00-051-8554
NSN 5996-01-651-0056
NSN 6130-01-500-5651
NSN 5998-01-375-5162
NSN 5935-01-513-9623
NSN 6650-01-337-9970
NSN 5905-00-540-6997