These auxiliary locks for sliding windows combine ventilation and security, offering peace of mind with a set of 4. - Type: Simple auxiliary lock for sliding windows - Quantity: Set of 2 - Functions: Ventilation lock, security lock - Size: 11.7 x 2.5 x 0.3 cm - Materials: Stainless steel, adhesive tape - Country of Manufacture: Thailand Thank you for viewing. I purchased these to prevent my child from falling, but I am selling them now as my child is past the age where I was concerned about that.