Using the DeWalt ELITE SERIES Flap Disc is easy. First, make sure your grinder is turned off and unplugged. Then, attach the flap disc securely to the grinder. When using it, apply moderate pressure and move the grinder smoothly over the surface you want to work on. This will help you get the best results and ensure fast material removal. As for safety, always wear safety goggles, gloves, and a dust mask. Keep your work area well - ventilated to avoid inhaling dust. Don't exceed the maximum RPM of 13,300, or it could damage the disc and be dangerous. To maintain the flap disc, after each use, clean it gently with a brush to remove any debris. Store it in a dry place away from moisture and extreme temperatures. This will help keep the ceramic grains and the backing cloth in good condition, so your flap disc lasts as long as possible.