A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5935-01-573-8217
NSN 6220-00-118-6112
NSN 6110-01-192-6960
NSN 5895-00-276-7916
NSN 5990-00-497-9234
NSN 5950-01-331-5278
NSN 5965-00-716-7078
NSN 6220-01-251-1389
NSN 5975-01-593-8009
NSN 5999-01-018-6972
NSN 5990-01-042-1984
NSN 6240-01-541-0789