Using these Lenox reciprocating saw blades is easy. First, make sure your reciprocating saw is turned off and unplugged. Then, insert the blade securely into the saw's blade clamp. When you're ready to cut, hold the saw firmly and start the motor. Guide the saw through the thick metal at a steady pace. Remember to wear safety goggles to protect your eyes from metal shavings. For maintenance, after each use, wipe the blades clean with a dry cloth to remove any metal debris. If the blade gets dull, don't try to sharpen it yourself. Instead, replace it with a new one from the pack. Store the blades in a dry place to prevent rusting. With proper use and care, these blades will serve you well for a long time.