[Heavy-Duty Steel Bracket, Rounded Corners] - The bottom sliding barn door guide features a black powder coating for durability and rust resistance. It sits flush with the floor, preventing any protruding screws, eliminating the need for recesses or drilling. This wall guide features rounded corners, countersunk holes, and recessed screw heads for a snug fit, protecting children and toes from injury. [Easy Installation, Suitable for Multiple Applications] - This heavy-duty sliding door guide mounts to the wall with screws. These low-profile sliding door rollers are perfect for indoor and outdoor use, such as living rooms, or DIY projects like laying carpet over concrete slabs. They hold doors/gates securely against the wall. Step-by-step assembly instructions are provided for easy installation. [Smooth, Quiet, Ultra-Lightweight] - Our adjustable bottom rollers feature built-in ball bearings for smooth, effortless rolling. Unlike other larger rollers, ours only have two small bearings. They provide balance and stability on both sides of the door. Their small footprint provides greater maneuverability and ensures the rollers align perfectly with the door. [ADJUSTABLE CASTER POSITION] - Fully adjustable to accommodate different barn door thicknesses. Fits doors up to 2.125" thick with both rollers, or up to 3.75" thick with the inside roller removed. They fit most sliding closet doors by adjusting the roller position in the track to fit your door panel.