Slightly open patio sliding doors for a breeze or children and pets to enter/exit at play leaves you vulnerable for a break-in; the Winlock is an open patio protector!!! A homes’ patio door is among the most used entry spot for burglaries. The WinLock Patio Safety and Security Lock is a first-of-its-kind product that promotes child safety and prevent burglary by interlocking the patio sliding doors together to the door panel (inside) and the panel (outside). This visible deterrent made with steel connection protects the patio at the center to provide dual double protection. WinLock patio protects the outside and inside of the window when others only protect the inside and can be easily removed by using a device to reach and remove the device. WinLock patio is easy to install with no tools needed and safeguards open and closed patio doors. Please also see our Winlock Window safety and security bar that provides double hung protection when closed or using appliances: Room Air Conditioners, Dual Fans, Portable A/C Ventilation and New Models of Air Conditioners U-Shaped and N-Shaped.