Adjustable Caster: It comes with an adjustable roller, which makes the door smoother. Easy to use: Fix it to the wall with the screws, no additional wood is needed to make it work smoothly. It adapts to all types of door to provide smooth operation and comes with range adjustment from 2.5cm to zero. Material: The sliding door floor guide is made of high strength steel and POM nylon. PREMIUM DESIGN: The heavy duty sliding door floor guide comes with a recessed design which gives it an excellent finish. And the door does not need grooves, which prevents damage to your door. Perfect Solution: This sliding door floor guide is the best solution for the home and is used with the floor, door panel, and comes with an adjustable roller as well as 2 floor guides and 4 sets of screws for easy installation. Product description Features: 1. Improves the appearance of the floor guide and protects screws or bolts and increases their structural life. In addition, it can prevent scratching the door exposing hard edges. 2. 8 in 1 installation Optional assembly methods, it means no matter what size your door is, it will almost certainly fit. 3. Coating with black powder surface, provides corrosion protection and long service life. Sturdy and durable construction with flush bottom to ensure the floor guide sits on the floor without scratching the floor.