The SolarRoof PV Mounting System has been developed as a universal frameless PV module mounting system for  pitched roof and flat roof installations. The innovative and patented aluminum base rails,Z modules and rail extension  technology eliminate the need for onsite cutting and enable quick and easy field PV module installations. For the various  roofs,we design the relative roof hook to make it easy mounted. For example:the SS Roof hook is designed to fix with the  tile roof, while the L feet is designed for the metal roof,tilt legs are designed for the flat roof,etc.