Dreambaby Sliding Door and Window Locks are an invaluable addition to your home safety checklist if you need to keep children safe from the risks associated with sliding doors and windows. Limits the width of the gap a sliding door or window can open so that a child can\'t slip out unnoticed. Particularly useful if you live in a highrise apartment, have an unfenced yard, or live near a busy road. Transparent and applied with super-strong adhesive. Suitable for glass and most other surfaces. To open, simply release the pin and open door or window as normal. Extra peace of mind for when you can\'t be everywhere at once. If the gap between the two panes of the door or window are between 8mm and 33mm, it will be possible for the sliding to function when the lock is disengaged. This will provide versatility and safety.