Product size: 3.8*7CM, thickness 0.6CM (error 2MM) Multi-functional: The multi-functional door handle child locks are designed to prevent kids up to 5 years old, from opening sliding doors, windows, cabinets, and closets, even when they are not under an adults supervision. Versatile and simple design: Only 1/4" thick, the safety latches blend seamlessly into your home. The pack of 4 child proof door locks are designed to work on all finished as well as unfinished surfaces like wood, glass, and marble. Easy to Install: The sliding door locks for kids safety take less than 2 minutes to install. It requires no tools since there is already a pre-applied 3M adhesive that ensures quick installation and durability. Damage-free removal: Remove without damaging the aesthetics of your furniture. Heat the installation surface of the door child safety locks for a few seconds using a hairdryer and then pull the lock.