Black & Decker KR504RE - 500W 10mm Hammer Drill is a powerful tool which is a perfect device for home use with hammer action suitable for drilling into concrete. With a highly-efficient motor of 500 Watt, this Black & Decker hammer drill can render a speed of 47,600 bpm. High-quality keyless chuck of these drills offers the convenience of quicker and easier chucking and un-chucking. These rotary drills offer variable speed for more control over the screw driving and drilling. The secondary handle of the Black & Decker Hammer Drill provides control over the actions performed. Rotary hammers have lesser vibration and can penetrate most concrete surfaces. Black & Decker KR504RE - 500W 10mm Hammer Drill comes with a lock on button for greater comfort of use and can be used as “drill only” or as “hammer only” which enhances their operation on for application like chipping bricks or concrete effectively.