A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6110-01-633-9660
NSN 5945-01-561-3114
NSN 5975-01-583-5822
NSN 6145-00-398-4405
NSN 6320-00-225-7013
NSN 6320-01-246-4390
NSN 5998-01-539-0041
NSN 5925-01-397-1460
NSN 6110-01-461-0604
NSN 5960-01-226-0342
NSN 5996-01-116-1087
NSN 6620-01-268-9693