MAKITA DGA455Z - 18V 4-1/2" Brushless Grinder - PaddleAutomatic 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, Brushless DC motor generates less heat buildup and is ideal for