... , 20T, 30T, 40T, 50T, 1Motorized Screw Jack. Motorized Screw Jack/Worm Gear Screw Jack/Worm Gear Screw Jack/Model: RN-0.5T, 1T, 2T ... , Pushing, Rotating 4. Power Source: Manually or Electrically 5. Characteristic: Positioning precision, Safely self-locking, Heavy duty, Uniform lifting speed, small ...