Detailed description
The small oxidation of the aluminum profile is an oxidation after the aluminum profile is processed. After the aluminum profile is anodized, all the cut and processed surfaces of the profile have an oxide layer, while the large oxidation of the aluminum profile is after we extrude it. Just put the whole profile directly into the oxidation tank for oxidation, but the surface layer of the aluminum profile after cutting or processing and the surface layer of the processed hole are free of oxide layer. In other words, if you need an oxide film on every exposed surface of the aluminum profile, then you have to choose "small oxide"
