I put one on my engine hoist. This gives me a quick place to throw the lever that pumps the hoist up and down on the hydraulic piston.
I'm a car guy, but i'm also a big computer nerd. Here is a nice geek tool hack tip for you. If you have an old harddrive laying around before recycling it tear it appart and remove the magnets from it. These are rare earth magnets and are very powerful. They are especially good for holding tools etc.