The Link-Belt 210 X4 is a hydraulic excavator in the 21-ton class, designed for general earthmoving, utility work, site preparation, and material handling. It is part of Link-Belt's X4 series and is commonly configured with a standard boom and arm, enclosed cab, and hydraulic attachments support. The machine is used in construction, roadwork, and excavation applications where digging depth, reach, and cycle efficiency are important. Typical features include a diesel engine, advanced hydraulic controls, and undercarriage designed for stability and mobility on job sites. Exact specifications vary by configuration, attachment, and production year.