Background Cardiac implantable electric devices are commonly used to treat heart failure. Little is known about temporal and geographic variation in use of cardiac resynchronization therapy (CRT) devices in usual care settings.
A hammer drill, also known as a rotary hammer, roto-drill or hammering drill, (see also rotary drill) is a rotary drill with a hammering action. The hammering action provides a short, rapid hammer thrust to pulverize relatively brittle material and provide quicker drilling with less effort.
The rotary hammer has a rotary part to move the hammer in a more circular motion, resulting in a more powerful drill or bore of larger holes into a masonry or concrete surface. This is the tool you want to drill through harder concrete, or for a hole larger than 1/2-inch. current rating is 3.5/5.