Using your DeWalt DWA8280HRT flap disc is easy. First, make sure your grinder has a compatible 5/8 - 11 arbor. Then, attach the flap disc without using any tools. You're ready to start grinding. For the best results, keep the grinding angle between 0 and 15 degrees. When using it, always wear safety goggles and gloves. Don't exceed the maximum RPM of 13,300. After each use, clean the disc to remove any debris. Store it in a dry place to prevent damage. With proper use and care, this flap disc will serve you well for a long time.