Using this PKT 8mm wheel hub stud install tool is easy. First, pair it with your cordless 3/8 drive impact. Start the installation process and be cautious not to over - tighten as the high - voltage impacts can be very strong. After use, clean the tool with a dry cloth to keep it in good condition. Store it in a dry place to prevent rust. Remember, the 3/8' drive impact extension, wheel stud, and wheel hub are not part of the package, so you'll need to get them separately if you need them. And this tool is sold one by one, so buy as many as you need for your project.