... ton, RN-50 ton, RN-100 ton.* Safely self locking, Positioning Precision, Heavy Duty, Uniform Lifting Speed, Low ... Pulling,Pressing,Pushing,Rolling.* Manual Operation and Electrical Operation are available.* Multiple Screw Jack Systems are availbale and fully synchronized ... their applied loads without needing any brakes or other locking systems.* Three reduction ratio are available for each model. ...