A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6105-01-018-0739
NSN 6220-01-455-9509
NSN 6685-00-905-7616
NSN 5990-01-202-7003
NSN 6130-01-159-7036
NSN 5985-01-566-9109
NSN 5945-01-172-8104
NSN 5915-01-633-9845
NSN 5925-01-084-7009
NSN 6620-00-105-3312
NSN 6220-00-200-7888
NSN 6220-00-827-0227