A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6220-01-006-0741
NSN 5895-01-571-2701
NSN 5960-01-595-6515
NSN 6685-01-361-7594
NSN 5999-01-374-4919
NSN 6685-00-583-2473
NSN 6105-00-723-2035
NSN 5925-01-330-6457
NSN 5910-00-154-0000
NSN 5915-01-425-8524
NSN 5960-01-386-5770
NSN 6650-01-508-3651