Industrial Solid Steel Balls for Better Weight Support:The slide rail is designed with two sets of ball bearings inside, all made with solid steel balls. In addition to maintaining the mobility of the slide, it effectively increases the load-bearing capacity of the slide. Full-extension drawer slides provide access to the entire space, and the drawers can be fully pulled out for easy storage. Rustproof, Long Life:The surface of the Slide adopts electrophoretic black process, which isolates the direct contact of water and air to prevent oxidation and rust of the slide and improve corrosion resistance. Over 100,000 times of opening and closing tests have been carried out to verify its durability, and the normal service life of the slide rail is over 30 years. Full Extension Slides: Full-extension slides provide access to the entire space and the drawers can be fully extended for easy storage. The slides are designed with two sets of ball bearings inside, all made of solid steel balls. Besides keeping the slides smooth, these bearings effectively increase the load capacity of the slides. Product Features:AOLISHENG heavy duty drawer slides are made of high quality cold rolled steel , high strength and high density. They can withstand intensive storage without deforming. The bottom is equipped with a limited rubber bumper and ABS plastic for good wear resistance and impact resistance. Tips for use:The rail length should be the length of the drawer. Metal parts are sharp when installing. It is recommended to wear gloves for installation. You can choose the size of the rails according to the depth of the drawer.