From company website: "When you need power and durability in tough drilling applications, this 7-amp hammer drill is for you. The variable-speed, reversible motor (0-1,100/3,100-RPM) is optimal for either maximum torque or maximum speed whether you are drilling into metal, wood, concrete or masonry. Harder materials are no match for the 52,700-BPM impact mechanism, and the 1/2-in keyed chuck provides increased bit retention even during those tougher tasks. A side handle allows for more control in heavy applications, and the 2-finger locking trigger is ideal during extended use. The overall streamlined design increases comfort and reduces user fatigue."