Adjust these three knobs as needed to suit a variety of projects. 1x 1.4mm/1.7mm/2.0mm HVLP Spray Gun kit. INDUSTRIAL GRADE SPRAYER: The one-piece gun body of the automotive paint gun is made of durable aluminum alloy, and the nozzle is made of brass, which provides better paint dispersion and atomization, giving you a smooth and even coating surface and a smoother painting experience.