Double load: AOLISHENG drawer slides are made of high quality 1mm cold rolled steel, and the material is 1 times thicker than ordinary slides. Full extension drawer slides support 100 lbs, 40 lbs more than regular slides. Double anti-rust: The surface of the drawer slides adopts black electrophoresis process, which isolates the direct contact between water and air, prevents the drawer slides from oxidation and rust, and improves the corrosion resistance. /p> 30-year lifespan: Two sets of solid steel balls are used inside the ball bearing drawer slides to ensure smooth opening and closing of the slide rail. After testing, the number of smooth opening and closing times of the drawer slider has reached more than 100,000 times. Installation guide: suitable for drawers with interior depth 12"-14 ". Left Side Mounting Clearance: 0.5" (12.7mm), Right Side Mounting Clearance: 0.5" (12.7mm). There are 8 screws in the card box at both ends of the product. Please push the inner ball bearing to the top of the slide rail first, then connect it to the slide rail. There are electronic installation instructions at the bottom of the link. Hidden function: The back of the slider is designed with a detachable buckle, which is more convenient to install.