This hook lock is a transformation from the previous as now this product using metal as the material made for a sliding door. The front plate of this product has no bump, but flat as the product is using a magnetic force. And the square front plate is in a hairline finish, which creates a solid-looking, modern and luxurious design that will suit any door. However, to suit your room, we are offering 3 different finishes as well.The screws are also installed in a hidden position, creating a clean looking product. When the sliding door is closing, the hook will automatically strike down, so the door cannot be opened. Thus, this product is good to prevent the door from bouncing or not closing perfectly. To open the door, pull the puller to lift the hook and move it. For child safety, you only have to attach it to the higher position of the sliding door. For its clean looking design and features, this product is sold for more than 3000 pieces in a year.