All Cormach cranes have the same constructive concept; Column with twin mast. Big dimensions slew bearing with rotation motor placed in external position, and gear box, The slew bearing is installed on base of the crane. Cormach design allows the stress distribution and prevents stresses concentration. The cantilever structure with the double column distribute stresses and shocks on the big dimensions slew bearing and through the bearing to the stabilizers and then to the ground thanks to the chassis that acts as a counterweight. The double sandwich structure of the double column is calculated to resist the torsion stresses created by the rotation and absorbs the shock created by sudden movements.