More precise than hydraulics and pneumatics: Electrical actuators provide a much finer level of control throughout the entire motion process enabling the force, speed and torque to vary at different stages during the motion. This capability helps reduce operating cost and increase throughput by reducing the number of equipment changeovers required during a process or for product changeovers in manufacturing. http://www.liftgasspring.com/linear-actuator/electric-linear-actuator.html