Cordless Angle Grinder with Brushless Motor (Tool Only), 4-1/2" Wheel, 18 VHigh performance and efficiency for heavy duty grinding applications Automatic torque Drive Technology (ADT) feature adjusts the torque and speed according to the load condition, enabling rapid movement between high speed and high torque applications eXtreme Protection Technology (XPT) offers maximum protection against dust, debris and liquids for optimal performance in extreme conditions Brushless DC motor with high power to weight and size ratio