roof's ventil stent part 1, Material: steel 2, Processing method: stamping,welding, zinc electroplating 3, customized design roof's ventil stent partItem name:ventil ... steel, carbon steel, aluminum, zinc, brass, plastic etc.Making process:Stamping, deep drawing, bending, punching, laser cutting, threading, welding , tapping, ... , Unigraphics, Auto CAD, (IGS, STP, STL and X-T) roof's ventil stent part