No hole installation saves time and effort. All you need to do is twist the key through the hole and the window plug to the . No additional installation tools are required. You can the window lock in any position with the vertical key. Easy to reuse and reinstall. adapts to most environments; effectively reduces the risk of children and pets falling from high windows. It keeps your family safe. This sliding window locks comes with a hex key, place it on the window or door , just the key control to install and remove. Colour:silver Material:aluminum Package Contents: 8 Sets x Sliding Window Locks 1 x opener key 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.