doing the brakes and discs on my A3 Quattro TDI and to get the discs of i need to remove the carrier and it is held on by 2 splined bolts part number N91168901 and size is M12 x 1.5 x 65 i might be silly asking this question but doing so and then i can buy the right tool for removal , it looks like a spline type ,question is ,the fact that its states 12mm is it the 12mm spline socket i need ? ,if you get my meaning .Thanks in anticipation