Using the Milwaukee 49 - 25 - 1231 blades is a breeze. First, make sure your oscillating multi - tool is turned off. Use the Universal Fit OPEN - LOK™ anchor to quickly attach the blade to your tool. When cutting through wood, nails, PVC, or drywall, apply steady pressure and let the blade do the work. For grout and mortar removal, the dual carbide grit and unique shape will make the job easier. Just move the blade gently over the area. As for maintenance, after each use, wipe the blade clean with a dry cloth to remove any debris. Store the blades in a dry place to prevent rust. Avoid using the blades on materials they're not designed for, as this can damage the blade and affect its performance. Also, always wear safety goggles and gloves when using these blades.