Using the Bosch GWX27LM450 wheels is a breeze. First, make sure your grinder has an X-Lock interface. Then, just snap on the wheel - you'll hear a click to confirm it's properly mounted. There's no need for any tools. For grinding or blending metal, start at a low speed and gradually increase as needed. When you're done, simply pull the lever on the grinder to release the wheel. Remember, these wheels are designed for use with small angle grinders and work best on metal surfaces. Always wear safety goggles and gloves when using the wheels. Store them in a dry place to prevent damage. If you notice any signs of wear or damage, replace the wheel immediately for your safety and to maintain performance.