A magnetic chuck is a tool used in machining to hold metal workpieces securely in place during processes like milling or grinding. It uses powerful magnets to create a strong magnetic field, which keeps the workpiece firmly attached to the chuck. This allows for precise machining without the need for clamps or other mechanical fixtures, making it easier to set up and change jobs. These chucks come in various sizes and designs, suitable for different types of machines, such as CNC machines or surface grinders. They are especially useful for flat or thin materials, ensuring stability and accuracy while reducing setup time.