A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6645-00-113-4441
NSN 5835-01-138-8622
NSN 6620-01-510-3501
NSN 6110-01-063-8309
NSN 5965-00-051-6434
NSN 6150-00-072-5973
NSN 5975-00-187-7728
NSN 5925-00-851-3605
NSN 5945-00-318-3542
NSN 5895-01-423-9146
NSN 6110-01-365-3923
NSN 5920-01-296-5461