We have Hitachi DV18DVC 18 Volt Ni-Cad Hammer Drill with Product Detail Max torque 380 in/lbs. Variable 2 speed 0-400 and 0-1,500 RPM 0-21,000bpm impact rate 1/2" Chuck 22 stage slip clutch . The "Hitachi DV18DVC 18 Volt Ni-Cad Hammer Drill" is best product for you. We recommended Hitachi DV18DVC 18 Volt Ni-Cad Hammer Drill