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21V 500n Difunctional Cordless Impact Wrench Screwdriver Power Tool for Drill. 500Nm ultra-high torque, removes anything. 21V battery powered, efficient and labor-saving; Brushless motor, strong drive, variable speed, high/low speed adjustment. Forward/reverse, tightening, self-loosening, reverse anti-off function. External 1/2"square chuck; Internal 1/4 inches hex, LED light illuminates core working area. LED light illuminates the core working area. Brushless motor, strong drive, variable speed, three-speed adjustment. Reserved hanging ring for suspended use to save effort. Quick change lock design.