The Bosch 25618 18-volt impact driver is powered by lithium-ion batteries. It is up to 27 percent faster than comparable cordless impact drivers. This impact driver is capable of driving a 3-inch all-purpose screw into a pressure-treated 4-by-4 in about one second; and can drive 3-inch by 1/4-inch lag bolt into a pressure-treated 4-by-4 in less than four seconds. The driver's robust motor delivers 2;800 rpm or 3;200 bpm. For driving force; the hammer system produces 125 ft/lbs of dynamic torque. It is compact and lightweight for easy handling. The impact driver has a 1/4-inch hex drive that provides fast and easy bit changes; while externally accessible brushes makes replacements simple. It is capable of driving up to 150 3-inch by 1/4-inch lag bolts between charges. The battery pack design protects the battery and the tool by preventing overheating; overloading; and deep discharging. The 18V impact driver are supplied with two BAT609 18V lithium-ion batteries; 60-minute battery charger; double-ended phillips bit; belt clip; and carrying case.