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The Charpy teste specimen design has the choice on the type of notches to use. There are three options of the notch design to choose from, 45^o V-Notch, Labeled keyhole, or U-Notch. By far the most common notch used for steel testing is 45^o V-notch. The specimen is cooled to the required temperature and placed as a simple beam in horizontal position on the anvil and is struck in the middle by the edge affixed to the swinging pendulum which strikes the specimen on the opposite face of the notch. A single over load breaks or tries to break, the specimen and the absorbed energy is recorded on the stop pointer.