A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6240-00-062-7078
NSN 7035-01-106-3476
NSN 5930-01-382-3423
NSN 6110-00-199-1616
NSN 6130-01-089-6763
NSN 6130-01-500-2359
NSN 6135-00-240-3200
NSN 5960-01-509-8779
NSN 5925-00-633-6236
NSN 5990-01-328-8225
NSN 5999-00-446-9111
NSN 6135-01-350-2932