These XZN triple square bits are great for working with BMW, Mercedes, VW, Audi, Porsche and most other European vehicles
Forged high quality S2 steel ensures durability
chrome plated chrome vanadium sockets provide maximum oil and corrosion resistance
Driver with breaker bars, torque wrenches and ratchet handles
10pc XZN triple square bit socket set includes:

1/4" drive: M4, M5, M6;
3/8" drive: M8, M9, M10, M12,  Tamper-proof(with center hole): M14
1/2" dri: Tamper-proof(with center hole)-M16, M18

Q&A
Q: What's the difference between XZN-Triple-square spline and 12 points spline bits?
A: The triple-square, also known as XZN, is a type of screw drive with 12 equally spaced protrusions, each ending in a 90° internal angle.  Common sizes are 6, 8, 10, and 12 mm. The name derives from overlaying three equal squares to form such a pattern with 12 right-angled protrusions (a 12-pointed star). In other words, three Robertson squares are superimposed at a successive 30° rotation. 
The spline screw drive has twelve splines in the fastener and tool. It consists of 12 equally spaced protrusions, each with a 60° angle. It is achieved overlaying 4 equilateral triangles, each one rotated 30° over the previous one.

it is a bit hard to check by eyes if the angle is 90 degree. Easy way is to lock at every 2 corners after 2. If you connect the profile lines of 2 corners, you can have a horizontal line. Do the same downward, you can have a vertical line. Please see the attached photo which we used exact horizontal and vertical line on computer which just the same as the product profile which means the angle is perfectly 90 degree.

Please note the profile of this XZN triple square spline is straight line with 90 degree at the corners, which is different from 6 point torx or 5 point torx the profile is curve line and the arch part is round and narrower than concave part.