Lighting up and down telescopic boom, lamps expansion joints, telescopic instrument

Lighting up and down telescopic boom, lamps made from high quality aluminum expansion joints extensometer material, all spray, anti-static. Light weight, oriented, high strength characteristics. Constant Spring closing spring made of imported special steel with a special treatment, durable, corrosion-resistant, service life is not less than 50,000 times. The use of the characteristics of the constant force spring mounted on the hinge, together with the corresponding fixture to achieve vertical lift function. When used according to need, to stay in any height, neither fall nor retraction phenomenon, to ensure accurate positioning. You can load 2-15Kg, length 1.2 / 1.5 / 2 / 2.5 / 3 / 3.5 / 4 / 4.5 / 5 meters optional.