Use in high accuracy tension control situation, can provides many kinds of torque control, has a great ability of radiation, can have a widely application in processing of industries, as the packing, tissue paper and corrugated paper. The friction disc of chucks brake can choose at will, convenient for the installation and the maintenance, it can use with the user brake disc.DBK air brake already available in on equipment of brand-new design and also equipment transformation. This model can supply the type with cooling fan or not.