Adjustable castors for sliding door: fully adjustable barn door guide, fits doors up to 75mm thick.Safety Design: floor roller with special design, flat bottom and rounded edges protect your toes and knees from injury.Sturdy and durable: The adjustable door guide is made from carbon steel with a black powder finish to ensure indoor and outdoor use.Easy to install: wall mount with screws, and no grooves are needed for the door. By adjusting the rollers in the rail to fit your door panel. No need to drill holes on the ground.Size:1 package - SilverName: adjustable floor guide.Contents:1 steel bracket.2 ribbed plastic dowels.2 short screws.2 long screw bolts.1 key.Color: Silver.Fully adjustable for doors up to 75mm thick and easy installation.Perfect for your door: fully adjustable for doors up to 75mm thick and easily adjusted with the included key to guarantee most barn door sizes or types.Fully recessed on the floor.Special design with lower cutting slot to allow the barn door bottom bracket to remain completely flat on the floor and the fixing wall screws will be aligned flush with the bracket to avoid going out and scratching against the door.< br>