This article is from the VW Technical FAQ, by with numerous contributions by Jan Vandenbrande others.
A: Most VWs use an 8mm 12 point internal spline, aka CV Joint tool aka triple
square.
Snap On triple-square CV socket, Part number (3/8" drive) = FTSM8C.
KD #2304, fits in a 5/16" socket.
Also available from other brands/dealer.
According to Greg Moore: It's also the same fitting as is on the teardrop-
style alloy wheel covers. [Verified: Tom Coradeschi]
 
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