Master Magnet Screwdriver & Large Tool Magnetizer/Demagnetizer quickly and easily magnetizes small tools so they attract screws or nuts for easy starting and removing. To use, simply insert the screwdriver or nut driver into the hole and pull it out. It's that easy! This tool is perfect for do-it-yourselfers, mechanics, and electricians. This Magnetizer/Demagnetizer makes it possible to Magnetize metal items such as screwdrivers easily. Also demagnetizes items using an innovative step design. Designed for indoor uses.