The terminoligy I heard here on the list is a triple square. This makes
the most sense to me...

            Eric                   86-VW4x4
            vw4x4@fyi.net          72-240z
            Pittsburgh, PA USA     1936-Chrysler

On Mon, 3 May 1999, Todd Hill wrote:

>  kayakjr@JUNO.COM writes:
>
> <<  I believe the correct term is 12 point internal spline recess
>      driver - anyone else on this? >>
>
> My Stahlwille catalog calls it an 'XZN'.  If you look very closely
> at a new bolt head you will see that instead of 12 - 90* angles
> for a 'triple square' the corners appear to be more like 85*.
>
> My 10+ year old Wera brand 3/8ths drive tool works just fine
> as its splines have worn over the years and the same holds
> true for the CV bolts.
>
> -Todd Hill
>  VolksWerks Transaxles
>  Olympia, WA
>  360-412-0948
>