A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5990-00-524-2293
NSN 6105-01-254-1793
NSN 6105-01-633-3485
NSN 6645-01-495-0939
NSN 5915-00-151-7849
NSN 6130-01-069-1784
NSN 5905-01-419-1057
NSN 6645-00-066-6868
NSN 5895-00-814-8462
NSN 6240-00-578-0893
NSN 6130-00-639-0666
NSN 5999-01-218-3853