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.
There are a number of different types of blacksmiths' tongs, each used for something different: 1  Flat jaw tongs have flat, rectangular grabbing points and are used to grip flat pieces of metal. 2  Duck bill or slot jaw tongs generally have flat jaws and are used for handling flat stock.