Using your Klein 44131 folding utility knife is easy. To open or close it, just press the push button. When you need to change the blade, use the patented snap - lock and sliding mechanism. For safety, always make sure the blade is locked in place before use. When not in use, keep the knife folded to avoid accidental cuts. As for maintenance, clean the blade regularly with a dry cloth to prevent rust. Store the knife in a dry place. If the blade gets dull, replace it with a standard utility blade. That's all you need to know to keep your knife in good condition and ready for any job.