According to the material, it can be divided into: metal corner guard, PVC plastic corner protector, winglet protector, wingless corner protector.

The angle protector is divided into the angle bar of the sun angle (the angle of the yang angle is installed in the protruding wall angle, the angle of the section of the large section is more than 90 degrees) and the angle angle bar (the Yin angle is installed in the concave corner, most of which are small round holes, and the section angle of the section section is less than 90 degrees. " ), bending angle bar and T type angle bar; the angle guard can also be divided into: the heat preservation angle bar and the decoration angle bar, and the wing protection angle bar is attached to the metal or PVC profile to anchor into the plaster, and the non wing angle bar is perforated on the metal or the PVC instruction section, allowing the angle bar to be directly embedded in the plaster. Now the angle strip used in the construction has been extended from the material and the use to all directions, so the previous introduction should be supplemented from the classification and function.