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SECURE ACCESS: This keypad door lock offers secure keyless entry with a customizable 3-8 digit combination code.EASY INSTALLATION: Designed for quick and easy installation on most standard doors, with all necessary hardware included.Door thickness range: in-in (mm) thick.fully mechanical design NO ELECTRICITY: No need for electricity, zinc alloy panel, stainless steel lock body, hard and not easily damaged, rust resistant, windproof and waterproof, safe and durable.Operating temperatures range from -31℉ to ℉( -35℃ to 75℃ ).DURABLE CONSTRUCTION: Made from sturdy zinc alloy for long-lasting durability and reliable performance.AUTOMATIC LOCKING: The lock automati,and Inside lever always unlocked.So you can never worry again about remembering to lock the door.