Using your Bosch T118E jigsaw blades is easy. First, make sure your jigsaw is turned off and unplugged. Insert the T - shank blade into the blade holder of your jigsaw until it fits securely. Once it's in place, you're ready to start cutting. When you're cutting medium to thin metals, aim for straight lines for the best results. Remember to use a proper lubricant while cutting metal. This will not only make the cutting process smoother but also extend the life of your blades. As for maintenance, after each use, wipe the blades clean with a dry cloth to remove any metal shavings or debris. Store them in a dry place to prevent rusting. If you notice the blade is getting dull or damaged, it's time to replace it with one from your pack of 5.