*Versatile Tool Set: This 4-piece tool set includes wrenches of 5/16, 7/16, and 9/16 sizes, designed specifically for brake adjustments on heavy-duty trucks, for ensure you have the right tool for every job. *Enhanced Functionality: The automatic slack adjuster tools enable efficient release and maintenance of air brake systems, enhancing the performance of heavy-duty vehicles, long-distance trucks, and trailers. PLEASE NOTE: The vehicle compatibility should be used as a guide only, on occasions there might be more than 1 option available for some vehicles. We use the latest information provided by the part manufacturers to make the listings as accurate as possible but please always check the full specification before making a purchase. If you are in any doubt then please contact us w.