Using your Lenox 618R reciprocating saw blades is a breeze. First, make sure your saw is turned off and unplugged. Then, insert the blade into the saw following the manufacturer's instructions. When cutting metal, apply steady pressure and let the blade do the work. Don't force it too hard as this might cause the blade to break. As for maintenance, after each use, wipe the blade clean with a dry cloth to remove any metal shavings. Store the blades in a dry place to prevent rust. If you notice the blade is not cutting as well as it used to, it might be time to replace it. And always wear safety goggles and gloves when using these blades to protect yourself from any flying debris.