A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6150-01-271-4535
NSN 4140-00-168-1920
NSN 5895-01-481-4261
NSN 5835-01-584-4408
NSN 6110-01-128-3050
NSN 6105-01-551-6819
NSN 6145-01-187-3989
NSN 6685-00-067-8437
NSN 5950-01-444-1789
NSN 5985-01-510-4113
NSN 5960-01-648-1872
NSN 5975-00-411-4186