A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 4140-01-268-7904
NSN 5998-01-280-9348
NSN 5950-00-137-6482
NSN 5960-01-513-3230
NSN 5975-01-047-0069
NSN 6610-01-415-1623
NSN 5999-00-140-9244
NSN 5990-01-121-1175
NSN 5855-00-149-0766
NSN 6110-01-423-1655
NSN 6150-00-199-8764
NSN 5960-01-447-7074