That looks like a kit for cleaning the nozzle only. The fine wires and pin vise are for the nozzle aperture and small holes in the end of the needle valve. The scrapers are for the needle valve seat in the nozzle. If the tool with the aluminum handle has an L-shaped scraper on the end, it is for the chamber around the needle valve seat. It can also be used for the nozzle seat in the nozzle holder. The brass brush is for exterior nozzle cleaning and can also be used on the nozzle holder. In addition to what is in the kit, a couple of tube brushes would be needed for the interior of the nozzle holder and insert.