It’s classified as follows:

WP350, the load capacity is 350kg, the max lifting height is 1300mm, the min lowest height is 350mm

WP300, the load capacity is 300kg, the max lifting heitht is 900mm , the min lowest height is 300mm

WP500, the load capacity is 500kg, the max lifting height is 900mm, the min lowest height is 300mm

WP750, the load capacity is 750kg , the max lifting height is 1000mm, the min lowest height is 400mm