Shelves of quality discrimination mainly from the following several aspects:
First of all, the welding process, welding mouth is smooth.This is very intuitive can be observed.
Next, want to see the shelves of material that it is difficult to see, general shelves the thickness of the material can be observed according to their own requirements.
The third depends on the structure of the shelf, beam depends on how much you have linked and prison is not strong, closely, it remains to be seen whether hook and the pillar of the medial post depends on uniform cross-section bending condition, the more uniform, the better.
Finally depends on the shelves of the surface treatment, spraying the surface is bright and clean, smooth, colour and lustre is consistent.