Product name: Left and correct folding sliding home windows Advantage: 3 years guarantee High-quality materials Strong load-bearing Silent and soft Invisible installation Feature: 100 percent high quality. One-piece molding of tremendous and high-strength aluminum The thickness is not easy to deform, the load-bearing means is strong, the structure is stable, it has good anti-corrosion, and it is not frightened of humid surroundings High high quality tender bearings --High uniform hardness, high wear resistance, load bearing 30KG Easy Installation:The hardware integrated simplifies the setup process, making it a hassle-free addition on your space. Note: This product could be personalized with longer tracks, Suitable for greater variety of windows. If it is best to customise longer tracks, please be happy to contact us. We also provide whole-house customization, can customise diversified high-end furnishings hardware Dear friends, when you've got any questions on the product, please be happy to contact us.Instruction manual is incorporated in the equipment and we can additionally present set up video.