Solid Industrial Steel Balls for Better Load Capacity: 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 rail, it effectively increases the load capacity of the slide rail. Full Extension Drawer Slides provide access to the entire space, and the drawers can be fully extended for easy storage. Rost-Proof, Long Lifespan: The surface of the slide rail has been electroplated with blue zinc treatment to isolate direct contact with water and air to prevent oxidation and rust on the slide rail and improve corrosion resistance. More than 100,000 opening and closing tests have been conducted to verify its durability, and the normal service life of the slide rail is more than 30 years. 3-Fold Full Extension & Extendable: Triple extension allows the rails to be fully extended, allowing the drawer to be fully pulled out for easy access to the entire storage space within the drawer. By pressing the drawer handle and continuing to pull, the inner rails can be removed for easy installation and cleaning. Product Features: Heavy-duty drawer slides are made of high-quality, high-strength, and high-density cold-rolled steel. They can withstand heavy storage without deformation. The bottom is equipped with a limited rubber bumper and ABS plastic for good wear resistance and impact resistance. Usage Tips: The length of the rail should be ≤ the length of the drawer. The metal parts are sharp during installation. Gloves are recommended for installation. You can choose the size of the rails according to the depth of the drawer. We wish you a happy life.