This extra long tool is necessary for removing the two hard-to-reach oil pan screws on many late model VW and Audi engines. Hex-ball end (5 mm) fits 5 mm hex drive pan screws utilized on TDI from 1999 onward (ALH code), 2.0 liter gas engines and any others with a 5 mm hex socket drive. This ball-hex bit also fits early TDI (1996-1998) 1Z and AHU engines codes that have screws with 6 spline drive. Many newer models may apply.
Also handy for removing the differential drain plug on can-am off-road vehicles such as Maverick, Defender and Commander.