A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 4140-01-218-4997
NSN 5905-00-730-0294
NSN 5998-01-145-4860
NSN 5920-00-910-4531
NSN 5905-01-626-6297
NSN 5910-00-233-5484
NSN 6650-00-279-5741
NSN 5915-00-553-8755
NSN 5998-01-425-8045
NSN 5905-01-341-4108
NSN 6130-01-451-5599
NSN 6650-00-269-5000