A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6645-00-033-8714
NSN 5895-01-376-0482
NSN 5925-00-964-9654
NSN 5920-01-453-7523
NSN 5965-01-392-1761
NSN 6105-00-118-1508
NSN 5935-01-139-5491
NSN 5920-01-421-5362
NSN 6135-00-967-3112
NSN 5999-01-062-1774
NSN 6220-00-296-4101
NSN 6240-00-393-1161