Using the Klein 3212TT erection wrench is simple. First, make sure the bolt size is 3/4 - inch and the nut is a U.S. heavy type. Place the wrench head on the nut and turn it to tighten or loosen. The continuous taper on the handle helps you easily line up the bolt holes. When working at heights, use the built - in hole to tether the wrench to prevent it from falling. Remember, the tether is not included, so you'll need to get one separately. As for maintenance, keep the wrench clean and dry. After use, wipe it down to remove any dirt or debris. If it gets rusty, you can use a light oil to clean and protect it. Also, check the stamping on the wrench for the catalog number, bolt size, and nominal opening size for easy identification each time you use it.