worm screw lift; Safely self locking, Positioning Precision, Heavy Duty, Uniform Lifting Speed ... ;Low ratio,1 turn shaft,0.25 mm stroke. * Electric Motor Horsepower Range 0.03 ~ 21.5 HP.* Trapezoidal ... Speed 3600 mm/min* Accessories: Bevel Gearbox,Hand Wheel,Electric Motor,Motor Flange,Frequency Inverter,Safety Nut,Steel Cover,Rubber ... ,Chemical industry,Health Care,Culture,Health,etc worm screw lift