Perfect for demagnetizing tweezers, screwdrivers, and other small tools and parts. Will also magnetize tools such as screwdrivers if you desire. This magnetizer has a high power to weight ratio and is housed in non-breakable plastic. It is 120V AC intermittent use type, which features a 1/2" by 3" opening and is 300 watts. A necessary addition to any workbench.