A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5950-01-543-7585
NSN 5915-01-589-9899
NSN 6620-01-413-4170
NSN 5835-00-518-2740
NSN 6110-00-411-0217
NSN 6105-01-017-9077
NSN 5895-00-530-5310
NSN 5855-01-634-0259
NSN 6135-00-351-8606
NSN 5935-01-145-4944
NSN 5996-01-599-1972
NSN 4140-01-013-6807