First, it is the accuracy of the geometric shape of that surface without getting the undulating too large, undulating are often left by the public before.Second, the finished surface is not there are scratches, stains, holes and Flake toppings, pitting, ... the surface of the finished products often suffer from a kind of unavoidable defects that is "solid eye", with thin sheet products then this defect easily observed are but the product is not the lamellar eye can hardly recognize.
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