The profile bending attachment PB20 is the optimum complement for tube bending on models 3000 and 6000. The device can be installed easily and quickly on the bending shaft without requiring tools. The workpiece is clamped onto the rotary disc with the clamping device and drawn around the bending tool. By means of this system leg lengths to be bent off can be precisely measured in connection with a length arrester and can be bent with good repeatability.