Secure your home or office doors with additional security with this ,Security Door Lock . This door bar lock is a security locking device for hinged, swing-in doors, allowing a door to be slightly opened 2”to allow safe viewing and ventilation. It can also be placed out of reach of children, high on a door, so they cannot open the door themselves and enter or exit into dangerous areas. Installation is quick and easy 1. Please choose the right location on your door and let its main body be aligned with the sub-body, then make marks of the screw holes. 2. Fix the main body to the door frame with screws. 3. According to the mark, fix the sub-body with screws on the door. 4. Close the door and test the door lock. Specifications - Material: Premium zinc alloy - Finish: Beautiful plating process -Application: Ideal for limiting door openings and home door secure in residences, home, hotel, motel, Inn etc. Package Includes 2x Swing bar lock Specification: Quantity: packs security reinforcement swing door lock Material: Thicken solid zinc alloy, satin nickel Color: Silver Hinged Bar Length: 3.9 inch / 10cm