Using the Makita A-98815-25 cut-off wheel is easy. First, make sure your 4-inch angle grinder is turned off and unplugged. Then, install the wheel onto the grinder following the manufacturer's instructions. When you're ready to cut, hold the grinder firmly and start it up. Slowly bring the wheel to the material you want to cut, applying gentle pressure. Keep the wheel moving steadily to ensure a clean cut. As for safety, always wear safety goggles, gloves, and a dust mask. Don't use the wheel if it's damaged or cracked. And never exceed the maximum speed rating of the wheel. For maintenance, after each use, clean the wheel to remove any debris. Store the wheel in a dry place to prevent rusting. If you notice any signs of excessive wear, replace the wheel to keep getting great results.