A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6105-00-422-4098
NSN 5920-01-551-3414
NSN 6145-00-565-9560
NSN 6620-01-615-2322
NSN 5935-00-927-7662
NSN 5915-00-358-2407
NSN 6240-01-599-2679
NSN 5960-01-170-5932
NSN 2925-01-446-6976
NSN 5855-01-542-9059
NSN 6240-01-068-5961
NSN 5999-01-056-4490