The power tools use an engine that runs with the help of gasoline and also the motors which runs on power or condensed air. The power tools are also used for several purposes, like household errands, constructions and for factory activities. Most of the power tools work with the help of electric motors and are hence called as electric power tools. With the help of electric power tools, the work gets finished quickly and more effectively but while using these electric power tools one has to be more attentive and alert than normal manual tools.