A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6150-01-057-1706
NSN 6130-01-535-0077
NSN 5999-00-883-1451
NSN 6685-01-616-6133
NSN 5930-00-136-0831
NSN 5945-01-422-4565
NSN 2925-01-111-2927
NSN 6150-00-644-8745
NSN 6650-01-323-6252
NSN 6240-01-397-8713
NSN 5950-01-320-4406
NSN 5965-00-465-9566