For efficient cleaning of the injector port and seating surface prior to fitting new injectors. Helps to avoid blow-back due to poorly seated injectors.Contents include: 2 x Silicone Nylon brushes 15mm, 20mm; 3 x Brass coated Steel wire brushes 18mm, 22mm, 25mm, 1 x Steel wire injector nozzle port cleaner. 224mm long bit driver with quick chuck, 6 x port sealing plugs plus insertion rod.