The Adjustable Triangle Rack Mounting System is designed to provide an adjustable tilt angle of the solar bracket. This mounting system can be installed on both metal roof and flat concrete rooftop. This system is designed with a telescopic rod tube on the triangular supporting kit, which make the tilt angles adjustable by changing length of the telescopic supporting tube. It’s easy to install and usually applied in cases to position quite a few PV panels. With main parts made of surface anodized aluminum AL6005/T5, the system can stand firm and keep a long life service.