A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 2925-00-099-4030
NSN 5925-01-643-5706
NSN 4140-01-526-1804
NSN 5945-01-451-3501
NSN 5920-00-296-9869
NSN 5915-01-412-8667
NSN 6150-01-553-3090
NSN 5999-00-959-2486
NSN 5935-00-597-1752
NSN 5935-01-500-8427
NSN 5960-01-023-8037
NSN 5925-01-100-4029