The ATOMIC 20V MAX 4" Angle Grinder, No. DCG400, from DeWalt is the company's first cordless 4" angle grinder compatible with standard 4" x 3/8" and 4" x 5/8" accessories. This tool is equipped with the DeWalt ANTI-ROTATION System to help maximize control. This feature quickly stops the wheel when a pinch, stall, or bind-up event is sensed, reducing reactionary torque. An ergonomic design allows access to ultra tight spaces, while the clip-on guard can quickly convert a Type B guard into a Type A guard. According to DeWalt, the grinder is 13 percent lighter than competitive pneumatic angle grinders, and delivers up to 44 percent more power than 0.7 HP rated pneumatic angle grinders.