The ball screw jacks can be employed for lifting, pulling, moving, aligning any kind of load with a perfect synchronism, which is difficult to obtain by means of other handling devices.The ball screw jacks are suitable for high services as well as for a very rapid, quick and precise positioning. As compared to trapezoidal screw jacks, it presents a transmission REVERSIBILITY: it is therefore advisable to provide for brakes, blockings or contrast torques in order to avoid a direction reversal. Screw jacks can be applied singularly or in groups properly connected with shafts, joints, and/or bevel gearboxes.