This is a multi-functional sliding window safety lock with key. To prevent sudden closure of doors and windows or children's movement. Lock can be set to a normal state, if , can be set to a normal closed state. Also perfect choice homes, shopping malls, hospitals, schools, offices and homes, etc. Features - Color: White+silver. - Material: Zinc alloy. - Size: 4.00X3.50X1.80cm/1.57X1.38X0.71in. - Perfect for patio doors, sliding glass doors, sliding windows, etc. - 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 homes, shopping malls, hospitals, schools, offices and homes, etc. - Each sliding window lock has a key, and can be tightened by rotating the key. - Heavy-duty zinc alloy construction ensures durable and rustproof, reusable and reliable. Package list: 1 window stopper lock with key