The Li-Ion 20V Brushless 1/2" Impact Wrench, No. ARI20156, from ACDelco, offers an advanced brushless motor that delivers 320 ft-lbs reverse torque and 205 ft-lbs tightening torque. The entire tool weighs 2.86 lbs, allowing users to sustain daily work efficiently without becoming fatigued. The ARI20156 features metal gearbox housing, variable speed with reversible and electronic brake control precision, rubber boots, built-in LED and battery power indicator.