Product name: Upper and decrease folding window accessoriesAdvantage:3 years warrantyHigh-quality materialsStrong load-bearingSilent and smoothInvisible set up Feature:100% high quality.One-piece molding of fine and high-strength aluminumThe thickness isn't always easy to deform, the load-bearing capacity is strong, the structure is stable, it has good anti-corrosion, and it isn't scared of humid environment High quality mushy bearings --High uniform hardness, excessive wear resistance, load bearing 50KGEasy Installation:The hardware incorporated simplifies the setup process, making it a hassle-free addition for your space. Note:Dear friends, you probably have any questions about the product, please be happy to contact us.Instruction guide is included in the package and we can also provide set up video.