Corner bracket is often used to connect two aluminum profiles. Because of its easy installation and excellent connection effect, it is a common accessory during the installation of aluminum profiles. Now we have three types of corner bracket, namely 45 degree type, 90 degree type and 135 degree type, which are used under different degree of aluminum profiles. The 45-degree type is used when the two aluminum profiles are connected at an angle of 45 degrees. The 90-degree type is a conventional type and is used when two aluminum profiles are at 90 degrees. The 135 degree type is used when the angle between two aluminum profiles is 135 degrees.