A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5945-00-405-9345
NSN 5910-00-069-5095
NSN 5925-01-504-7731
NSN 5915-01-100-2097
NSN 5960-00-188-8648
NSN 5925-01-644-9578
NSN 6130-00-844-2792
NSN 5925-01-242-9945
NSN 5998-01-425-4499
NSN 6685-01-480-9230
NSN 6320-01-237-9746
NSN 5835-01-105-6545