
A power tool utilizes a power source and mechanism, other than manual labor that is used for hand tools. Electric motors are the most common types of power tools, power tools are used for construction, gardening, household tasks, drilling, cutting, shaping, sanding, grinding, routing, polishing, painting, heating and many other purposes. Power tools are categorized on the basis of power source: electric power operated tools (e.g. circular saws, drill machines); pneumatic power tools (e.g. jack hammers, chippers, and compressed air guns); liquid fuel (gas) powered tools (e.g. saws); hydraulic power tools (jacks), and powder-actuated tools (nail guns).