If you're doing any head work on your Audi/VW, chances are you're going to need one of these. Audi/VW uses a unique Polydrive bit for securing their heads to the block. We've seen some of the imitation tools out there and they don't quite compare to this one. This fits perfectly and is long enough to not require any clumsy extensions. It features a 1/2" drive and fits all OEM and numerous aftermarket head bolts and stud kits.