Using these Bosch jig saw blades is quite easy. First, make sure your jigsaw is turned off and unplugged. Insert the T - shank blade into the blade holder of your jigsaw. It's designed to fit about 90% of jigsaw models, so it should fit snugly. When you're ready to cut, start with slow and steady movements. These blades are great for straight - line cuts on pipes, profiles, and thin metals. For the best results, use proper lubricant when cutting metal. This helps reduce friction and extends the life of the blade. As for maintenance, after each use, wipe the blade clean to remove any metal shavings. Store the blades in a dry place to prevent rusting. Since they're made of high - speed steel, they'll last a long time if you take good care of them. And with 100 blades in the pack, you'll have plenty for your projects.