... Precision, Heavy Duty, Uniform Lifting Speed, Low Efficiency, Use Infrequentl worm screw liftConfiguration: Worm Gear, Worm Shaft, Taper Roll Bearings, Seals ... Safely self locking, Positioning Precision, Heavy Duty, Uniform Lifting Speed, Low Efficiency, Use Infrequently, Easy Installation, Low Noise.* ... Screw Pitch Range 5 ~ 16 mm.* Max Linear Speed 3600 mm/min* Accessories: Bevel Gearbox,Hand Wheel, ...