A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5905-00-028-6784
NSN 6105-01-056-5258
NSN 6220-01-109-7379
NSN 5945-00-853-4375
NSN 5915-00-497-0774
NSN 5950-00-157-3785
NSN 5910-01-607-2569
NSN 5905-01-475-3734
NSN 6610-00-079-1508
NSN 5925-00-369-7747
NSN 4140-01-356-3726
NSN 5915-01-202-8426