<p>Safety is priceless: The apartment window security is made of high quality metal, more durable than other plastic or PVC products to withstand the impact, more thick and durable, not deformed and rusty, indispensable window security guards for families.Note: Before purchasing our adjustable window security bar, please confirm your window size to avoid the situation that it cannot be used. This window security bar internal security device is only suitable for small windows (window frame 9.8-16.7 inches). If your window is larger, you are welcome to enter ZhouDaShu store to purchase another longer window lock bar (window frame 16.3-29.3 inches)Keep your family and children safe: The window security lock can control the window to partially open or close, effectively reducing the risk of children and pets falling from high windows. The window safety bars also allows you to keep the window open a small part when you sleep with the air conditioner on, enjoying the air circulation while ensuring safety and keeping intruders out.Easy to use: You just need to put the window blocker security directly across the window rail or door rail after adjusting the length of the window jammer security bar to fix the window or door, tool-free installation and removal. For vertical windows, you will need to prepare your own Velcro or screws in order to secure the window safety locks to the window frame.Measure before purchase: Please measure the window or door rail where the window security bars will be placed before you purchase. The window rail must be at least 1 inch wide and 16.5 inches long to accommodate.Adjustable Design: The sliding window security bar can extend from 9.8" to 16.7" with 7 adjustable lengths to choose from. The window ac locks can withstand repeated impacts of forced entry, effectively preventing the window or door from being opened unsafely.</p>