Specification: Type: Adjustable Use for: Wood doors Material: Solid cast iron with powder coated Size: 4.8'' L X 2'' W X 2.5'' H Arm Thickness: 5 mm Package: 1pc Wall mount floor guide with two screws Features: Adjustable door guide with two rollers for bottom of the barn door prevent your door sway away from the wall. Works with all brands of sliding barn door hardware. Steel adjustable roller, smooth and quiet roll works with doors up to 2 1/5 " thick. Easily mounts to wall with 2 mounting screws (included). Looks great both indoor and outdoors. The distance between the floor and the door should be at least 1/4". No need to cut a groove in the floor. After-sale Service If there is any part missed or broken, we can ship the parts to you at first time.