Using the JAKEMY JM - X2 Magnetizer Demagnetizer Tool is a breeze. To magnetize a screw or bolt, simply run it along the tool's surface a few times in one direction. For demagnetizing, do the same but in the opposite direction. When using, keep it away from sensitive electronic devices as the magnetic field might affect them. After each use, wipe the tool clean with a dry cloth to prevent dust and debris buildup. Store it in a dry place to avoid rust. This tool is a great addition to your toolbox and will make your screw - and - bolt - handling tasks much easier.