These can be used on aluminum, wood and vinyl for vertical and horizontal sliding , single and double hung or doors The window safety lock is made of high-quality zinc alloy material, exquisite workmanship, stable wear resistance, not easy to corrode and rust, and can be used for a long time Installing window locks greatly improve the security of your home and prevent children or pets from opening or doors in a dangerous way. Improve anti-theft effect, protect your family and property safety., Manufacturer: PokFhgur