Using the Klein Tools 702-12 hacksaw is easy. First, adjust the blade tension according to your cutting needs, up to 30,000 PSI for fast and precise cuts. You can choose the 12-inch bi-metal hack saw blade for general cutting or the 6-inch bi-metal reciprocating saw blade for more specific tasks. For flush cutting, use the 45-degree mounting option. When you're done, store the blades in the handle for safekeeping. Remember to wear safety goggles when using the saw. To keep your hacksaw in good condition, clean it after each use and lubricate the moving parts regularly. If the blade becomes dull, replace it with a new one. This will ensure that your saw continues to perform well for a long time.