Battery-free, mechanical screwdriver with quick-release, Rapidaptor bit holder, allowing fast and easy bit change and single-handed operation. For use with all conventional 1/4" hexagon bits for a wide variety of screw profiles. Features button-operated turbo function, allowing gear to be fixed for control during fine adjustments or final tightening or loosening of a high torque screw. Can be used without turbo function for couplings with steadily increasing torque. Interchangeable VDE blades supplied offer fast and safe working. Robust, maintenance-free steel gear provides long product life. Chrome Molybdenum Steel Blades Ergonomic Handle Tested to 10,000V, Rated to 1000V Chrome Molybdenum Steel Blades Ergonomic Handle Tested to 10,000V, Rated to 1000V