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, the 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 fit, age ratings and product language, labeling or instructions. Includes fit, age ratings and product language, labeling or instructions. This child safety device is used for most swinging or sliding doors and windows. Easy to install padlocks and easy to use. Supplied with all security fixing accessories, it prevents accidental opening of the window and protects interior security. Universal locks perfect for most hinged or sliding doors and windows. Supplied with all security fixing accessories. Sold in a set of 4PCS Patio sliding slide locks, with keys. Suggest blocks are top mounted and bottom for maximum security. Each slide lock is supplied with 2 keys, the keys are universal.