Flat Roof Solar Panel Roof Mounting Systems Triangular Bracket The flat roof solar panel mounting system Solar triangular bracket, with innovative triangular to save cost both on installation and transportation. It is installed directly on a rooftop or pre-made concrete cement block. All kinds of panels can be installed which will save time for your project. Product information: Material Aluminum alloy: 6063 T5/ Stainless Steel 304 Shape According to drawing and sample