A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6620-01-517-0014
NSN 7035-00-631-3782
NSN 5950-01-650-2957
NSN 6645-00-279-1777
NSN 6105-01-481-7687
NSN 7035-00-135-4758
NSN 5945-00-666-0530
NSN 5965-01-633-8849
NSN 6685-00-077-1943
NSN 5925-01-016-1146
NSN 5905-01-304-7146
NSN 5895-01-486-7862