The Bosch PS42N 12V Max Brushless Impact Driver is a lightweight, highly efficient 1/4" hex driver.. The Bosch Performance Management system provides two speed settings - one for high speed and one for high torque - with idle speed ratings of 0-1200 and 0-2600 as well as no-load RPM ratings of 0-2700 and 0-3100 IPM. Brushless motor and all-metal gearbox ensure efficiency working time and long service life.