When you select a strike from our EN Series you are making a smart choice. It is UL listed 10C Fire-Rated and 1034 Indoor Outdoor Burglary Resistant. The EN Series has only one locking mechanism. We have tested this product well and beyond BHMA GRADE 1. Durability-1,000,000 life cycles and Holding Force-2000 lbs. UL tested. UL outdoor rating allows the strike to go where others can't go.