L-foot Steel roof mounts secure the railing on the roof. Refer to loading tables (below) for Rail span information. The L-foot is made from aluminium and must be used with the supplied EPDM pad to prevent galvanic corrosion to the roof material. Component: L foot 1# STANWIC U-nut EPDM pad Wood screw Hexagon socket screw kit Features: 1, Easy Installation: The tilt-in U-nut can be put into the extruded rail from any location and can be highly pre- assembly with the L foot to minimize the time and cost of installation. 2, Great Flexibility: With the Stanwic racking system, framed solar panels can be easily mounted on metal roof. It has excellent compatibility, and suitable for most size solar panels. 3, High Accuracy Long hole in L foot allowed height adjustment for whole system. 4, Excellent Adaptability Engineered to High Standard Stanwic racking system is safe and strong, 5, Maximum Lifespan All components are made of quality extruded aluminum and stainless steel. The high corrosion resistance guarantees the maximum possible lifespan and is also completely recyclable. 6, Guaranteed Durability Stanwic provides a guarantee of 10 years on the durability of all components used.