Installation Guide --Suitable for drawers with a depth of 12-14 inches.0.75 inches of space should be set aside on both sides of the drawer and cabinet wall for mounting drawer slides. Note:During installation, be sure to ensure that the slide rails on both sides remain parallel. We have upgraded our product packaging. Please note that some products do not include mounting screws due to different production batches. You can purchase different M5 screws for your specific installation. 30 Years Service Life --The surface of the drawer slide is treated with electroplated blue zinc, which has super oxidation resistance and corrosion resistance.Tested under full load, it can reach 150,000 opening and closing times.Note: The longer the rail length, the lower the load capacity.