The tool works by engaging a large number of fins on your exhaust nuts to establish a good purchase / register on the nut.
Thanks to the design, they are light enough to take with you on the road.
A finned exhaust nut wrench. It is CNC cut from steel, industrial zinc plated and features a bright red rubber grip coating to add comfort. These tools look and work great!. Note: You should be removing your finned exhaust nuts annually and applying a high quality anti seize to the threads. This will save you a very costly repair later! If your nuts do not want to come off, cut them off to avoid damage.