Surface requirements:
1 no scratch, bruising, ramps, blisters, grinding lines.
Copper layer 2 oxidation, smooth surface, no corrosion, fingerprints, twill, horizontal grain, no repairing scars, dent.
End requirements
1 the arc smooth transition, light, natural.
2 end level, coating, surface adhesion phenomenon of annoyance-that peeling.
3 hole wall, smooth, corrosion and corrosion bruise.