PORTER-CABLE PC180HDK-2 18-Volt Cordless NiCd Hammer Drill Ideal for boring large holes and driving screws and lag bolts into wood, masonry and concrete High-output motor and drive train generates 490 inch-pounds of maximum torque 24,000 BPM at 1,600 RPM makes fast and easy work of concrete and cinderblock drilling applications Metal locking, single-sleeve 1/2-inch chuck assures secure bit retention and solid durability Removable side handle that rotates 360 degrees in any orientation for flexibility and control