This is a chrome plated nozzle tip used on the PFP (servo) cutting head on some HTX, Mark III, and Optiplex lasers. This is the "Pencil" shape that is compatible with the nozzle adaptor part number M501S1 for the PFP (servo) cutting heads.
Chrome Plated / Double Nozzle version available here
Also known as L1585X or 36143312240.