What does PCD 112 mm mean?

PCD stands for Pitch Circle Diameter, which is the diameter of the centres of the five fixing bolt holes.

The wheels for an A3 8P have a PCD of 112mm. Other cars have different sizes.
 
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To further add as I think its a little clearer than Dave's comment although he is correct about the name:

What is the PCD?
PCD stands for Pitch Circle Diameter and is a measure of the wheel stud/bolt hole locations. The PCD is a circle with its centre at the centre of the face of the wheel. The centres of the mounting holes are equally spaced around this circle. So for example, a 4x100mm PCD means four mounting holes, equally spaced around a 100mm diameter circle form the centre of the wheel
 
Sorry i should posted the question he asked me ..

I could be intersted but please confirm PCD 112mm to fit A6.
 

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