Tool set necessary for cleaning Diesel injector seats prior to fitting new injectors. Contents: Silicone nylon brushes - 2pcs. (15mm, 20mm) Brass coated stel wire brushes - 3pcs. (18mm, 22mm, 25mm) Steel wire injector nozzle port cleaner - 1pc. Portsealing plugs - 6pcs. Insertion rod for sealing plugs - 1pc. Extension rod - 1pc.