Bosch HDH181X-01L 18-Volt 1/2-Inch Brute Tough Hammer Drill/Driver with Active Response Technology Active response technology - superior control in bind-up situations Heavy duty construction - built tough with bosch exclusive durashield housing and all metal gearbox to withstand rugged jobsite conditions Maximum power - 752 in lbs of torque powered by a 4-pole motor Advanced electronics - individually customized electronics protect the motor and battery increasing tool and battery life Flexible power system - compatible with all bosch lithium Ion batteries