A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5835-00-129-9913
NSN 6145-01-568-1832
NSN 6240-01-349-6320
NSN 6320-01-392-6922
NSN 5950-00-948-0214
NSN 5835-01-504-0837
NSN 6320-01-343-8191
NSN 6685-01-545-7910
NSN 5990-01-632-0969
NSN 4140-01-243-5817
NSN 6105-01-422-9501
NSN 6610-01-465-1320