A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6110-01-415-0589
NSN 5999-00-984-0602
NSN 5835-01-416-6449
NSN 5999-00-152-5009
NSN 5999-00-893-4748
NSN 6240-00-696-0249
NSN 5905-00-897-5509
NSN 6150-01-544-7312
NSN 6105-01-609-8128
NSN 6610-01-493-6269
NSN 5985-00-251-1453
NSN 5935-01-154-2738