A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5985-01-617-2652
NSN 5905-01-508-4907
NSN 5999-00-800-0944
NSN 6105-01-256-9136
NSN 5835-01-540-4995
NSN 5935-00-305-4873
NSN 5920-01-140-1120
NSN 6620-01-503-2667
NSN 6610-00-699-0714
NSN 5935-00-135-2127
NSN 5945-01-341-1939
NSN 6685-01-451-2603