A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6650-01-081-1537
NSN 5930-01-132-5790
NSN 5915-01-441-0388
NSN 6610-01-037-9858
NSN 5895-01-653-9844
NSN 5905-01-570-6765
NSN 6650-01-459-8575
NSN 7035-00-142-9076
NSN 5895-01-495-6873
NSN 5930-00-829-0178
NSN 6685-00-761-9655
NSN 6685-01-151-7106