Feature: 1. Rack installation must be completely parallel to the guide rail, with long service life. 2. With exquisite workmanship, reliable quality and high safety, it can be perfectly applied to your sliding door. 3. The installation and replacement method is simple, which is suitable for all kinds of villa sliding door motors. 4. Perfect sliding door accessories, stable performance, can make the sliding door smooth. 5. Made of high quality zinc iron material, durable, wear-resistant, can be used for a long time. Specification: Condition: 100% Brand New Item Type: Gear Rack Material: Zinc Iron Weight: Approx. 28000g / 987.7oz Distance Between Gear and Rack: 2mm / 0.08in Size: Length: Approx. 100cm / 39.4in Thickness: Approx. 1cm / 0.39in Width: Approx. 3cm / 1.18in. Package List: 6 x Gear Rack18 x Screw Note: 1. The rack shall not be directly welded on the door, the pillar and rack, and the racks shall not be welded.2. Do not use the motor as the welding ground wire to avoid damaging the motor. Shield the motor during welding to avoid spark splashing.3. Please allow 0-1 inch error due to manual measurement. Thanks for your understanding.4. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.