The lift sub is a necessary holding tool for lifting drill pipe, casing, tubingdrill collar in drillingworkover trip operations. It is used for lifting drill pipe, casing, tubingdrill collar.

The main types of cranes are side opensplit open (middle open), designedmanufactured in accordance with API SPEC 8C Specification for DrillingProduction Lifting Equipment, with load classes of 35, 65, 100, 125, 150, 200, 250, 350, 500tons.