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: Black. - Material: Plastic, steel. - Size: 5.60X3.80X2.50cm/2.20X1.49X0.98 inch. - Heavy-duty construction ensures durable and rustproof, reusable and reliable. - No punching installation, no punching, easy replacement, installation. - Sliding window locks can be easily applied sliding windows to give children environment. - Effectively reduce the risk of kids, old and pets falling from heights, guard against robbery or theft. - Ensure family members are safe, and improve indoor air circulation. Also perfect choice for rest homes, shopping malls, hospitals, schools, offices and homes, etc. Package list: 1 x lock 2 x keys