1.Size details: the overall dimensions of the light mounting bracket are 90 x 15 mm / 3.54 x 0.59 inches, 100 x 16.5 mm / 3.93 x 0.65 inches and can be used to install different types of lighting fixtures. Please confirm the desired size before purchasing. 2. material: the ceiling light mounting bracket is made of iron, which is strong and durable and is not easy to deform or break. The screw threads are clear and burr. Suitable for longterm use. 3.Easy installation: screws and installation accessories are included in the package. You only need to screw this ceiling light panel into the round ceiling light base and can easily complete the installation, even if you have no installation experience. 4.Wide application: this lamp holder is ideal for pendant lights, wall lights, chandeliers, outdoor wall lights, kitchen wall lights, wall lighting and ceiling installations, but not suitable for ceiling fans with high weight.