This mounting bracket is a great companion for commercial and non-commercial trailers. It is made out of durable and sturdy steel. Mounting is simple and placement is versatile. Measures 12 inches length x 5-7/8 inches width x 1-3/8 inches diameter. The two cut outs are designed for two standard 4 inches round lights. Customize your own light brackets with Grand General's quality lights, grommets and mounting brackets.