The model 4120-22 core rig comes with a large cast aluminum base and 4 leveling screws for fast accurate leveling adjustment. The durable precision-ground 2-1/2 in. steel column is 43-1/2" high and has a universal motor adapter plate. It is also equipped with a reversible feed handle, a model 4096 coring motor, Vac-U-Rig® kit as well as a meter box. The Vac-U-Rig® assembly uses a vacuum pump to apply suction to a large pad mounted on the bottom of the rig. This aids in stability when coring holes.