... screw lift; Safely self locking, Positioning Precision, Heavy Duty, Uniform Lifting Speed, Low Efficiency, Use Infrequentl worm screw ... Electrical Operation are available.* Multiple Screw Jack Systems are availbale and fully ... Flexible Linking Shaft,Trunnion Base,etc.* Application Industries: Machinery,Metallurgy,Construction, Irrigation,Chemical industry,Health Care,Culture,Health,etc worm screw lift ...