This Is a New Heavy-duty Lock Slide Rail with Good Stability, Small Swing, Smooth Sliding, Easy to Use, Suitable for All Kinds of Cupboard, Tool Cabinets and Other Large Equipment, Is the Furniture Industry, Caravan and Industrial Field of High-quality Choice. Specification: Colour: Silver Type: Heavy Slides Material: High Quality Cold Rolled Sheet Bearing Capacity: 120kg Surface Treatment: Blue Zinc, Electrophoretic Black Installation Form: Drawer Side Installation Specifications: 20"-40”(1000mm). Origin Length: 19.6-39.3”. Extended Length: 39.3”-78.7”. Features: 1. the Surface Is Coated with High Density Zinc Metal, Which Can Effectively Prevent the Corrosion of the Product Surface and Prolong the Service Life of the Product. 2. Anti-skid Rubber Pad, Increase Friction.