The "keys" are made veeeery thin aluminum sheet less than 1 mm thick. (0.5 mm possibly)
So you can completely forget about this product - no stability.
Modifies the work quickly - and I'm not Grobmotoriker / idiot - a trained machinist.
In addition, no fit - what pisses me the most.
Thus, this article is completely unusable for an Audi A4 8E ...
(Factory radio - Chorus II - cassette - get with it does not unlock - no clicks, no function)
Bought in vain 3 - - Conclusion burned ... well ...