A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5960-01-300-6788
NSN 5990-01-421-5342
NSN 6220-01-301-8637
NSN 5999-01-604-8551
NSN 6150-00-798-7004
NSN 5925-01-634-0664
NSN 5930-01-646-3004
NSN 4140-01-388-2007
NSN 5895-01-485-2470
NSN 4140-01-473-9080
NSN 5960-00-954-4825
NSN 5910-01-269-7177