Wera Star Magnetizer/Demagnetizer is a compact and efficient tool designed to magnetize or demagnetize your screwdrivers with ease. Measuring just 48mm in length, this handy device is less than 2 inches across, making it much smaller than it appears and for convenient use and storage. To magnetize a tool, simply run it across the positive inset of the Wera magnetizer/demagnetizer, which instantly allows the tool to hold screws securely. When you need to demagnetize, just run the tool down one of the four negative sides, marked from green to black, to quickly remove the magnetic charge. This versatile and practical tool is an essential addition to any toolkit for improved handling of screws. Model Number: 05073403001