Using the Makita 224377 - 1 Inner Flange is easy. First, make sure your 4' Angle Grinder (models 9553NB, GA4030) is turned off and unplugged. Then, simply install the inner flange on the grinder. You can now attach non - hubbed accessories without any hassle. When using, always wear safety goggles to protect your eyes. Don't use the grinder if the flange is damaged. For maintenance, keep the flange clean and dry. After each use, wipe it down with a dry cloth. Store it in a cool, dry place to prevent rusting. This way, your Makita inner flange will serve you well for a long time.