tools, electronic components cooling, the cooling of welding and so on, it is an perfect tool for small area cooling. Features: Cold air gun is the cold air source which is easy to carry, it is widely used in mechanical drying or cooling process. It can only use compressed air to lower the air temperature to produce low-temperature airflow. Clean and easy to install, and its flexible universal tube delivers cold air to the location where it needs to be cooled. An important device to provide cooling applications in harsh industrial environments and it can work continuously and stably. It has built-in control valve, thus you can adjust the volume of outlet air and the temperature according to the need. color: as shown Material: plastic + metal Working Principle: Cold air gun works by inputting compressed air into the vortex tube in a high-speed rotating way. In the course of this gas flow movement, the outer air will be heated, the inner air will be cold. When moving to one end, the air will flow back along the center of the vortex to produce cold air stream whose temperature is lower than the actual temperature of 25 degrees to 45 degrees and hot air below 110 degrees, thus a cooling source is formed. Package Contents: 6 x SE-WLG08 vortex tube + joint universal tube