Using this invisible force or magnetism, you can make your tools work like magnets or remove all electromagnetic force from your tools allowing you to complete a number of repairs from demagnetizing a screwdriver or tweezers to helping a watch spin it hands. The reasons that people might magnetize or demagnetize is that they might want the screwdriver to stay connected to the screw even while moving over to place a screw in the hole. Watchmakers will demagnetize tools to prevent accidental moving of parts and most importantly, prevent damage to parts by spreading magnetism and shorting electronic parts.