Made of high quality zinc alloy material, safe, non-toxic and durable. Keyed entry deadbolt with a traditional design for an exterior door, simple and elegant design is a good helper in your life. The single dead bolt can be locked or unlocked from outside with a key, and lock or unlock from inside with an associated turn-button. Vigorous torque knob, feel comfortable and beautiful, just lightly knob, all in control. With a screw driver, not need addional tools, deadbolt operated by key outside and thumb turn inside provides a safer environment, solid lock tongue, safe anti-pry. Suitable for kitchen doors, living room doors, hotel room doors and other interior doors. Features: Simple and elegant design is a good helper in your life. Zinc alloy panel, Brushing process, clear lines, durable. Vigorous torque knob, feel comfortable and beautiful, just lightly knob, all in control. Solid lock tongue, safe anti-pry. Integrated lock panel, simple and practical. Real materials, durable. Specifications: Material:zinc alloy. Suitable door thickness: 35-45mm. Package includes:1 x Invisible Door Lock.