A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5950-01-005-0111
NSN 6645-01-537-8558
NSN 5996-00-495-3086
NSN 5965-01-521-0941
NSN 5960-01-495-0859
NSN 5910-01-025-5408
NSN 6110-01-155-4048
NSN 5998-01-178-8333
NSN 5835-01-535-0948
NSN 5855-00-918-1622
NSN 6135-01-490-0278
NSN 6130-01-301-5609