A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6650-00-717-8913
NSN 6220-01-535-6968
NSN 5855-00-323-0967
NSN 6610-01-522-9882
NSN 6610-00-482-2265
NSN 5920-01-537-6243
NSN 5960-00-212-6367
NSN 4140-00-756-4193
NSN 5996-01-649-1277
NSN 5925-00-059-3317
NSN 5945-00-831-0382
NSN 6135-00-715-4001