The 21.6V Drill Driver from Panasonic (model EY7460LN2S) delivers 575 inch-pounds of torque at low speeds (100-400 rpm) and a high-speed range of 350-1,500 rpm. This tool has an all-metal variable speed gear system, fan-cooled ventilated motor, 18-stage clutch, 1/2-inch heavy-duty keyless chuck, electric brake, and quick-charging system. Its 3.0Ah Cobalt LI battery pack is protected by the unique GuardION system, which monitors each battery cell during charging and use to prevent overdischarging and overheating. Price: $377. 800-338-0552.