Suitable for: suitable for sliding door thickness from 1 to 1 - 3 / 8 inches. Please refer to the measurements in the picture before purchasing. Easy to install: no groove required for the door, no holes drilled in the ground. Durable and smooth for maximum efficiency and peace of mind. Easy to slide: the smooth roller can glide easily, then slide the door open without difficulty. The bottom of the sliding door floor guide is flat and does not damage the door and the floor. The matt black steel sliding door floor guide ensures high performance for your sliding gate. Flat Bottom DesignThis ladder lies on the wall behind the door and out of sight, giving your sliding door a clean look. Premium material: the floor guide is made of high-quality hard carbon steel and a smooth black powder coating, beautiful, robust and durable.