E-Mount Lag uses the patented QBlock Elevated Water Seal technology to provide superior waterproofing on composition/asphalt shingle roofs. Priced at a modest premium over commodity roof mounts, E-Mount Lag makes it possible to deliver Quick Mount PV quality even on price-sensitive jobs. It is backed by solid engineering and certified for strength and waterproofing by the ICC-ES (ICC-ESR-3744). All stainless steel hardware included for fast, single bolt installation. 20-year limited product warranty.