Semi-finished and finished products difference.
After molding from the die-casting machine, we will remove the defective products (mainly to remove some products with large defects that cannot pass the post-processing).
Then multiple polishing it to make the surface smooth and free of burrs.
After multiple cleaning and plating, the product is nearly finished.
The key step after plating is to inspect the goods and pass the factory’s QC inspection, it becomes a set of qualified door locks.