Windows are second only to doors when it comes to security vulnerabilities in a house. They are easier to open from both outside and inside. None of this matters when people unknowingly leave their windows open when home. So the safety of your family is likely worth this in our sliding window lock. Features - Color: White+silver. - Material: Zinc alloy. - Size: 4.00X3.50X1.80cm/1.57X1.38X0.71in. - Made of zinc alloy, the main material is strong and durable, anti-scratch, anti-wear workmanship, easy to open the surface. - Put it on the window or door , open and close by the part that needs the window. - Prevent and children from climbing the window, indoor ventilation, improve air circulation. - Suitable for being sent as a present for friends or family who have baby, they will love it. - Sliding window lock can be easily applied sliding windows to give children environment. Package list: 1 window stopper lock with key