The sliding door rollers are designed for single or double sliding doors. The 17mm wheels provide better contact with the barn door and slide smoothly and quietly. The wheels contain ball bearings to keep the door quiet and smooth. The barn door floor guide is made of stable and durable metal, sturdy and anti-oxidant, provides a longer service life and can resist rust, corrosion, and deformation. Easy to install, no groove required for the door, easy to fix the roller guide on the bottom guide in the right place and fix the screws. Suitable for most door panel sizes. The product includes a total of 4 floor guides, wide compatibility and high reliability, which can completely meet your daily use and replacement needs.