Vario-Tacho-Constamatic (VTC) full-wave electronics for variable speed change. Speed automatically remains constant under load. thumb-wheel for pre-selection of speed aluminum die cast gearbox housing for optimum heat dissipation and long life optimal cooling by axial/radial fan two-speed gear unit powerful impact mechanism robust Metabo Marathon motor for extra long service life Metabo S-automatic torque limiting clutch: to limit sudden reverse torque which can occur if the bit jams or catches in the material.
