Hilti 03482658 SIW 18-A 1/2-Inch 18-volt CPC Cordless Impact Wrench with Resistant Case and 1/2-Inch Square Chuck 18+-voltage Speed 1 no load 1000 rpm; Speed 2 no load 1500 rpm; Speed 3 no load 2300 rpm Electronic speed control; 3500 blows per minute 1/2-Inch square chuck Max torque 3rd speed: 1,769-Inch-Pound, 2nd speed: 1,194-Inch-Pound; 1st speed: 796-Inch-Pound