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The surface of the aluminium profile is lightly drawn with a smooth hard object, which can leave a white mark on the surface of the profile. If it can be wiped off by hand, it means that the anodised film is not wiped off. If it cannot be rubbed by hand, the anodised film has been wiped off, indicating that the anodised film is poor in firmness and too thin, and the surface quality is poor. The average film thickness of the anodised aluminium profile for doors and windows needs to be at least 15um.

To remove the old rollers, the sliding window must be removed from its frame. This can be done by lifting the window up and out of the track. Once the window is removed, the rollers can be accessed and removed using a screwdriver or a wrench. It is important to keep track of any screws or bolts that are removed during this process, as they will be needed to install the new rollers.