Hilti 03482659 SIW 18-A 3/8-Inch CPC 18-volt Cordless Impact Wrench and Impact Resistant Case with 3/8-Inch Square Chuck and Locking Ring 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 3/8-Inch square with locking ring Max torque 3rd speed: 1,548-Inch-Pound, 2nd speed: 1,061-Inch-Pound; 1st speed: 663-Inch-Pound