【4 Pack Window Door Locks for Kids】 4 Pack sliding window door locks with 8 universal keys, each sliding window door lock comes with 2 keys (the keys are universal). 【Easy Installation】 Comes with all safety fixing accessories including stainless steel screws. (Attention: drilling is required; the white cap is for decorating the hole created by the electric drill.) 【Zinc Alloy】 Made of zinc alloy, copper, rust-proof, durability and quality guaranteed. 【Child Safety Lock】 Prevents accidents caused by open windows and unlocked doors, helping to keep your children safe. Suggest that the locks be adjusted up and down for maximum safety. 【Application】 Suitable for most swinging or sliding doors and windows. Perfect for home, public institutions, hospitals, hotels, schools and other children's places.