A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6130-01-084-2178
NSN 5975-00-043-5203
NSN 5975-00-724-8501
NSN 5930-01-100-1244
NSN 5930-00-633-0213
NSN 4140-01-340-9198
NSN 6220-00-456-8378
NSN 5999-00-311-1060
NSN 5905-00-263-3453
NSN 5910-00-401-3110
NSN 5990-01-134-7756
NSN 5855-01-388-6837