voltage : 20V 
disc diameter : 100mm (4'')
spindle thread : M10
Switch type : Slider
no load speed : 9000rpm
soft start :yes
e-cluth : yes 
e-brake : yes
brushless motor of the angle grinder requires no brush changes.
DEWALT grinder's brake stops wheel in 2 second or less on average. 
kickback brake engages when a pinch, stall, or bind-up event is sensed and the electronic brake engages with maximum force to quickly stop the wheel, reduce the movement of the metal grinder and shut the grinder off. power loss reset prevents accidental restart following a power disruption when the tool is left in the ''on'' position
***Bare tool is not include battery and charger***