Using your Bosch T118A100 jig saw 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. Ensure it fits snugly for maximum grip and stability. When you're ready to cut, start with a slow speed to get the blade in the right position. These blades are great for straight cuts on 10 - 16 gauge sheet metal and 1/16 to 1/8 - inch thick thin metals. Remember to use proper lubricant when cutting metal. This will not only make the cutting process smoother but also extend the life of the blades. After use, clean the blades with a dry cloth to remove any metal shavings. Store them in a dry place to prevent rusting. If you notice the blades aren't cutting as well as they used to, it might be time to replace them. With 100 blades in the pack, you'll have plenty for your metal - cutting projects.