Pneumatic tools are similar in appearance and function to electric hand tools, such as sanders, grinders, drills, saws and impact wrenches, but are powered by compressed air, rather than by electricity, and are generally less expensive to operate, lighter in weight and more powerful than their electric counterparts. Many of us are familiar with a lug wrench. They come with most cars take the lug nuts off of a wheel in order to change a car tire. The air wrench (pneumatic tool) can easily do what was very difficult with the standard lug wrench. Pneumatic tools are basically air tools which are powered tools run by compressed air.