SAC SolarRoof system is a roof-mounting solution suitable for most types of pitched roofs. Using our innovative Rail Z modules and standard roof hooks SolarRoof has become one of the most versatile rooftop solutions in the world delivering a safe and cost-effective solution to installers everywhere. The S.A.C. Solar Roof Hook PRO fits under tiles and is screwed through to the supporting timbers with the three 85mm long screws provided the rail system then clamps on to the bracket. Screw head and bolts both 13mmThis bracket is used when the roof covering is slate or rosemary style tiles.