A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6645-01-463-3441
NSN 6650-00-981-1336
NSN 6220-00-905-5686
NSN 6240-00-211-6085
NSN 5960-01-196-3344
NSN 6110-01-469-3127
NSN 5999-01-089-3345
NSN 5920-01-508-4243
NSN 6130-00-578-9783
NSN 6145-01-113-2337
NSN 6650-01-053-8726
NSN 5905-01-359-1963