1.Features: Made of alloy steel, durable and strong. Surface coating treatment is more corrosion-resistant. Double wheel design, low noise, flexible, protects door paint from scratches. The wheel axle adopts oil-free bushing bearing design, simple and applicable structure. 2.Applicable: Suitable for the opening and closing of barn doors, sliding doors, and upper hanging sliding rail doors. The double wheel structure clamps the bottom of the door, which prevents the door from shaking inside and outside and provides flexibility for door movement. 3.Note: When installing the door, it is necessary to consider calculating the gap spacing at the bottom of the door, which must be greater than the thickness of the anti-sway plate; the position of the double wheels is adjusted to the appropriate position of the door to keep the door vertical. 4.Installation: There are 2-3 screw holes on the L-shaped bottom plate. Mark the drilling position and drill the holes. Insert the screw plugs into the holes, lock the bottom plate with the provided screws, put the bottom edge of the door between the double wheels, and adjust the gap position. 5.Tip: We have more than ten years of experience in designing and manufacturing household hardware. If you have any questions, please keep in touch to solve them.