A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5915-01-196-6016
NSN 5935-01-413-7645
NSN 2925-01-121-3355
NSN 5855-00-327-2112
NSN 6320-01-161-6640
NSN 6105-01-577-5310
NSN 5855-01-218-3735
NSN 5835-00-228-9082
NSN 5960-00-051-8903
NSN 5930-01-215-2007
NSN 4140-00-303-3133
NSN 6110-00-172-1809