General description Required for turning and releasing the lower ball joint to free corrosion and other obstructions. This tool is essential for maintenance and repair tasks involving the ball joints of specific Audi models. Technical specifications Drive size: 1/2""D Hex size: 27mm Diameter of hole: 18mm Length: 36mm Compatibility and accessories Compatible with Audi A4 (from 2007) Compatible with Audi A5 (from 2009) Compatible with Audi A6 (from 2011) Compatible with Audi A7 (from 2010) Compatible with Audi Q5 (from 2010)