This is a nozzle with a 3.0mm (0.12") orifice, used on a Mazak Mark II, NTX, STX, and all early Mazak Models.
This is the Wide version of the nozzle.
Double Nozzles have two chambers for the assist gas to flow through that changes the way the gas flows from the nozzle.
Chrome Plated nozzles are harder and last longer than the copper nozzles.
Also known as part number 46683302410 or L623X.