4 Pieces Child Window Door LockThis is a kind of sliding patio door safety lock, preventing accidental window opening, extra security for your child and the window, suggested that the locks are top and bottom mounted for maximum security, the home security system has been improved. 8 Universal KeysComes with 8 universal keys, have sliding door locks 4 Pieces, each sliding door lock comes with 2 keys, keys are universal. Easy InstallationEasy to install the locks and convenient to use, come with all security fixing accessories, include stainless steel screw caps. ApplicationSuitable for most hinged or sliding doors and windows, this design is very useful for home, schools and other children's places. International products have separate conditions, are sold from abroad and may differ from local products, including International products have separate conditions, are sold from abroad and may differ from local products, including product language, labeling or instructions.