【Solid Steel Industrial Balls for Better Weight Bearing】The slide rail is designed with two sets of internal ball bearings, all made of solid steel balls. In addition to maintaining the slide's mobility, it effectively increases the slide's load capacity. Full-extension drawer slides allow access to the entire space, and the drawers can be fully extended for easy storage. 【Rust-proof, Long Service Life】The slide rail surface adopts an electrophoretic black process, which isolates direct contact between water and air to prevent oxidation and rust of the slide and improves corrosion resistance. It has been tested over 100,000 times for opening and closing to verify its durability, and the normal service life of the slide rail is over 30 years. 【Full-extension slides】Full-extension slides allow full 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. In addition to maintaining smooth gliding, these bearings effectively increase the slides' load capacity. 【Product Features】AOLISHENG heavy-duty drawer slides are made of high-quality, high-strength, and high-density cold-rolled steel. They can withstand heavy-duty storage without deformation. The bottom is equipped with a limited rubber bumper and ABS plastic for good wear and impact resistance. 【Instructions for Use】The length of the slide must be ≤ the length of the drawer. The metal parts are sharp during installation. It is recommended to wear gloves during installation. You can choose the size of the rails according to the depth of the drawer.