... Duty, Uniform Lifting Speed, Low Efficiency, Use Infrequentl worm screw liftConfiguration: Worm Gear, Worm Shaft, Taper Roll Bearings, Seals ... .* Manual Operation and Electrical Operation are available.* Multiple Screw Jack Systems are availbale and fully synchronized.* Absolutely irreversible ... 0.03 ~ 21.5 HP.* Trapezoidal Screw Diameters Range 20 ~100 mm;Screw Pitch Range 5 ~ 16 mm.* Max Linear ...