【Auxiliary Lock and Security for Windows】This screen door lock is an auxiliary lock that can be installed on aluminum alloy frames. It can be easily installed by inserting it into the window groove and turning the knob. Install it on the window to prevent intrusion. It is suitable for preventing indoor intrusion from burglars and thieves, and for crime prevention measures for women living alone, and is also very suitable for homes with pets and small children. It is recommended to install it in two places, top and bottom, to further enhance the crime prevention effect. 【Locking While Keeping the Window Open】The screen door stopper can lock the window frame with the window slightly open, so it is also suitable for places that require ventilation, such as bathrooms, kitchens, and toilets. It is also convenient for families with children who have learned to open window locks, as it allows for ventilation while preventing access to the balcony. 【Shock-Resistant and Durable Material】The window lock uses iron and rubber materials, achieving high impact resistance and durability. By attaching a flexible non-slip rubber mat, the friction is increased, and it can be firmly fixed in the window groove without damaging the window. The knob is large and can be easily turned to lock securely. ⭐️Free Shipping⭐️.*° Please check the actual photos for the product condition♪ #Yucco's Product List is here ✨️☜ 29-18 1171 Auxiliary Lock Window Lock Screen Door Lock 4-piece set Sliding Door Window Stopper Iron + Rubber Sliding Door Lock Window Lock Screen Door Lock Cat/Dog/Child Window Lock Child Lock Window Sash Lock Easy Ventilation Safety Measures Crime Prevention Goods Durable Brown