Top Door Locks for Kids Safety: The child safety locks for doors for kids rests on top of the door like a saddle, it's out of reach or even out of sight, which prevent kids, pets or elderly people from going in and out of rooms unsupervised. Wide Compatibility: The adjustable child proof door lock fits for the thickness of the most standard hinged interior/exterior doors and French doors between 0.8- 2 inch (Please measure the thickness of your door first). Don't compatible with sliding doors (bifold doors, pocket doors), metal door frames, uneven door frames, patio screen doors, storm doors and double doors that swing both ways. Easy to Install: All it takes is drilling one small screw (Included) into your door frame, rest the toddler door locks on the top of door, and then slides back and forth to lock and unlock the door. Two Sides Operated, No More Accidental Locked: The baby door lock can lock or unlock doors from either side, so your child 't lock your out of room accidently like other types of lever door handle child locks. Sturdy Metal Door Locks: The child door locks top of door is made of high-quality painted metal, rust-proof and water proof, which can last for years and never crack or bend like cheap plastic. Color: Black Material: Metal Package Contents: 1 x Door Top Lock Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.