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 head on a claw hammer is made of steel, the handle of fiberglass, wood (commonly hickory, a tough, springy wood), or steel. Fiberglass and steel hammers typically have rubber, plastic, or vinyl handles for comfort and shock absorption.