This tool is a spanner wrench that has several different size pins. You can adjust the spread of the wrench using the thumb wheel. It can be set for the small pins on some steering racks, or the top of a shock tower. In addition the larger pins are great for holding pullies or even locking some sprockets. Facom is a French product that has a well deserved reputation for quality.Note: The pins have a metric thread. It is possible to use a bolt to make your own custom size lock...