The window safety lock is made of highquality zinc alloy material, exquisite workmanship, stable wear resistance, not easy to corrode and rust, and can be used for a long timeThese can be used on aluminum, wood and vinyl windows for vertical and horizontal sliding windows, single and double hung windows or doorsInstalling window locks will greatly the security of your home and prevent children or pets from opening Windows or doors in a dangerous way.antitheft effect, protect your family and property safety.size:Hole pitch: about 55mmMaterial: zinc alloycolour: whitePackage Contents:4 sets x window latch16 x mounting screwsOnly the above package content, other products are not included.Note:Light reflection and different displays may cause the color of the item in the picture a little different from the real thing.The measurement allowed error is +/ 13cm.