High Quality: The roller bearing: premium carbon steel. Surface: Frosted Black. Door stopper: The design of buffer springs can optimize the buffering effect and reduce the noise to protect the rollers. Roller diameter: 69.9mm. Sliding rail thickness: 5.8mm. Sliding rail track width: 39.9mm. Door Weight Capacity: Maximum 150kg doors are supported . Fit door panel thickness: 35mm-45mm. Fit door panel width: Maximum 1065 mm for one door. The length of rail track should be twice of the door panel. Package Includes: Splicing sliding door rail, 2 Rollers, other accessories for installation (screws, wall attachment, door stops, floor guide, install manual etc.). The door panel is not included. Note: Make sure that the wall is strong enough to support. If the thickness of the door frame or the baseboard on the wall is thicker than 15mm, you need to change accessories. Guarantee: 5 years factory warranty. If there is any part missed or damaged during shipping, please contact us, we will send replacement parts at no charge for missing/defect parts at once., Weight: 9.26 pounds, Manufacturer: cool artist