Easy-to-install, one-touch locks, set of 3. Used for crime prevention and to prevent babies and children from opening doors and windows. The one-touch unlock feature was also convenient. I bought too many in stock, so I'm selling them. - Type: One-touch lock - Quantity: Set of 3 - Size: Approximately 8.1cm x 3.5cm - Installation: Just stick with double-sided tape - Application: Door lock Thank you for looking.