It has the technology that ensures safety and the product's stability after installation. Easy and efficiently to install. Reasonable product structure and firmly fitting during installation. Thank you for your understanding.If the item is defective, Please notify us within 3 days, after the receipt of the item. We try our best to make our buyers satisfy. Let's solve the problem together! May all goes well with you, my dearest friends! So your positive FEED BACK is very important. Here is an illustration showing how to leave the positive FEED BACK. Please follow the following step. And welcome back to our store again.