This product was designed for German and Italian customers in 2015. Before the use of this product, similar products on the market could not exceed 150 degrees of stretching Angle in the working type. The product designed and improved by us can rotate and stretch 360 degrees in any direction. This product is widely used in Europe and the United States, It is well liked and praised by customers.The existing product length specifications are 2 meters, 3 meters and 4 meters, and the air duct diameter is 160mm. We can make different specifications according to different customers