A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5999-00-434-2099
NSN 5920-01-394-3826
NSN 5910-00-156-6357
NSN 5915-01-360-3787
NSN 5985-01-506-3097
NSN 6135-01-562-6582
NSN 6685-01-401-5360
NSN 5985-00-170-5864
NSN 5930-00-810-2989
NSN 5920-01-190-9032
NSN 5835-00-969-5771
NSN 5985-00-235-0006