A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5930-00-729-3768
NSN 6320-00-823-2015
NSN 6320-00-937-5625
NSN 6320-00-343-1798
NSN 6110-01-523-3400
NSN 5910-00-420-3305
NSN 6685-01-414-3596
NSN 5925-01-431-7057
NSN 5895-00-968-4857
NSN 5915-01-431-2321
NSN 6610-00-735-2888
NSN 7035-00-865-9105