The short body screw jack, as the name suggests, is shorter than the normal size body.It is more suitable for construction sites with limited space. Just imagine if the body of the jack is too high to be put in, how can it be lifted?So, the dwarf screw jack was born.Generally, in order to indicate the difference, we will add D before the normal model to show the difference.Screw jacks are also called mechanical jacks. The significant difference between them and hydraulic jacks is that they have no oil.The oil jack can only be used upright, so it is also called a vertical hydraulic jack, while the screw jack can not only be used upright, but also upside down.Screw jacks are mainly used for lifting objects, and are used in engineering operations such as automobile manufacturing, factories, pipeline construction, airport construction, and bridge construction. They are formed by a casting process, and the main body is made of ductile iron.