Hi-tech pneumatic tools manufactures compact, easy to operate, highly reliable and lightweight kilews electrical screw drivers. These screw drivers have a direct power supply from ac mains and no adaptor is required. These electrical screw drivers are available with salient features like double insulation in full compliance and appearance; high tech dc motor with super power magnet, quick start, low current, fan and vent set expedite hot air emission during long-term usage; accurate, adjustable and stable torque; stepless, speedy; improved production efficiency; for all kinds of screws and nuts; and clutch automatically disengages and nut stops upon screws being fastened to reduce wear on bit.