Rated load capacity: the weight of the material to be lifted, with a certain safety margin (recommended to be more than 1.25 times). · Lifting height: the vertical distance from the ground (or picking point) to the high placement point. · Span: The lateral working range covered by the three columns determines the lateral movement distance of the hoist. · Working system: Choose the motor power of the hoist according to the frequency of use (such as several times a day or continuous use).