How can I know this from the speifications from the site?
In the site http://www.seeedstudio.com/service/index.php?r=st/specification#Manufacturer is written
Drilling Hole(Mechanical) 0.3 - 6.35 mm
Finish Hole(Mechanical) 0.8 - 6.35 mm
I suppose that the 0.03 didn’t came from those values.
The only thing that has this same value is Out Layer Copper Thicknes, if this is the case, what is the relation of Out Layer Copper Thickness and a via?