Bosch HDH181XB Bare-Tool 18V Brute Tough 1/2" 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 - 750 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 18-Volt Lithium-Ion batteries