A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5998-01-490-2919
NSN 6220-01-242-9901
NSN 6110-01-101-6722
NSN 2925-01-187-5480
NSN 6105-00-196-0061
NSN 5895-00-080-2003
NSN 6145-01-573-7994
NSN 5910-01-279-2595
NSN 5990-00-232-3965
NSN 5910-01-174-5785
NSN 6240-01-618-7818
NSN 5855-01-372-4433