Easy Installation: Quickly and easily mount the fixed window guard over the interior casing for additional security and safety. To prevent small children from an accidental fall through open windows Enhanced Child Safety: The window guard features a narrow 3.8 inch bar spacing to prevent small children from an accidental fall through open windows Vertical Window Install :The window safety guards for children suitable for Height 19"and width 30"-54" windows.Typically used on vertical windows.Not for use on horizontal sliding windows or hinged casement-type windows Non-Egress : Not for use in bedrooms or other sleeping quarters where alternative emergency exits are not present Upgrade Design: The window safety guards for children , there areThree sizes of 14 "*38",19 "*54", 19"-38"for choice.And our window guard can fix to one by one ,Suitable for stack installation.