characteristic-520N. M high torque, smooth variable speed switch.-Powerful electric wrench, versatile and super powerful.-Tungsten steel shaft, high hardness and wear resistance.-Suitable for construction sites, maintenance, wood processing, etc. D-Brushless motors do not generate sparks during operation and do not wear out.SpecificationsColor:black+blueVoltage: 18 voltBattery Type: 388VFNo Load Speed: 0 - 4200 rpmImpact frequency: 0 - 3800 ipmMaximum Torque: 520N.MSquare Drive:1/2"