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.
Craftsman Bolt-On 2-Speed Hammer Drill. The hammer drill attachment is larger than the basic drill/driver that comes with the starter kit, but it offers two speed settings, a hammering mode for drilling into masonry, and improved ergonomics.