A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 7035-01-564-4617
NSN 6320-01-343-8191
NSN 6650-01-376-6965
NSN 6620-00-797-2591
NSN 5960-01-234-0926
NSN 5935-01-441-7700
NSN 5910-01-596-1685
NSN 5985-01-023-1708
NSN 6135-00-368-5578
NSN 6320-01-449-1014
NSN 5835-01-392-3105
NSN 6685-01-418-0925