4PCS Childrens Window Door Locks 4PCS Sliding Door Locks with 8 Universal Keys, each sliding door lock comes with 2 keys (keys are universal). Easy Installation Supplied with all safety fixing accessories, including stainless steel screws. (Attention: drilling is necessary; The white cap is used to decorate the hole made by the electric drill.) Zinc alloy Made of zinc alloy, copper, anti-rust, durability and quality guaranteed. Child safety lock Prevent accidents due to open windows and unlocked doors, useful to protect your children. Suggest that the locks be adjusted up and down for maximum security. Application Suitable for most hinged or sliding doors and windows. Perfect for the home, the public, hospitals, hotels, schools and other places for children. Color: Black Features: Universal locks ideal for most hinged or sliding doors and windows Sold in a set of 4pcs patio sliding door locks window locks with keys Each lock is delivered with 2 keys (the keys are universal) Suggest that the locks be installed at the top and bottom for maximum security Supplied with all safety fixing accessories Easy to install and easy to use