Thanks to all who responded with the technical name and aliases.
I also printed the picture and description from the ebay listing.
Now I'll go out and see what I can find on a Sun morning...

Martin

--- On Sun, 8/16/09, mark drillock <mdrillock@COX.NET> wrote
> Triple Square is one name and XZN is
> the real name. Yes they have 12
> points but the angle of the corners is different from
> normal 12 point
> bits. The XZN has sharper corners to resist rounding.
>
> Here is the CV tool version, the longer thin shank helps
> clear the CV
> boot on the ones blocked by the angle of the CV axle.
>
>
> http://cgi.ebay.com/ebaymotors/XZN-Tool-Vw-Jetta-Golf-Passat-CV-Joint-Volkswagen-Audi_W0QQcmdZViewItemQQ_trksidZp4634Q2ec0Q2em14Q2el1262QQhashZitem27aa6b7bbfQQitemZ170362895295QQptZMotorsQ5fAutomotiveQ5fTools
>
> M8 is the size needed and that means it is the size for
> bolts with M8
> threads.
>
>
> Mark
>

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