Metabo SB18LTX Impulse 18V 1/2-Inch Hammer Drill Kit Powerful Metabo 4-pole brush motor with 974 In./lbs of torque 0-500 / 0 to 1700 RPM 0-32300 Impacts per minute Electronic clutch with 11 different settings that provides a wide range of applications and doesn't develop any noise like other clutch systems Multi-functional protection system that provide overload protection and kickback protection when the the accessory is blocked suddenly.