The Lisle Alternator Decoupler Pulley Tool Kit is an essential tool for any mechanic. This kit contains everything you need to easily and quickly remove and replace alternator pulleys. The kit includes a special decoupler tool to safely release tension on the alternator belt, a special wrench to hold the pulley in place, and a pulley removal tool to remove the pulley from the alternator shaft. The kit also includes detailed instructions to help you get the job done right the first time. The Lisle Alternator Decoupler Pulley Tool Kit is a must-have tool for any mechanic.