Feature 1Smooth Sliding: 4 wheel design ensures smooth rolling performance with good stability, and the operation is very safe and easy with low noise. 2Good Structure: Adopting rolling bearing, the trolley assembly has been through fine welding and CNC crafting to form highly sturdy structure. 3Extensive Uses: Allows for wide application on home movable doors, wardrobe, large iron doors, curtains, automatic equipment components, etc. 4Steel Material: The utilization of premium carbon steel and stainless steel materials enables greater durability against rusting and corrosion. 5Easy to Install: Comes with a compact size and a light weight as well, the trolley roller is very convenient to install within several minutes.SpecificationItem Type: Trolley AssemblyMaterial: Carbon steel, stainless steel. Color: SilverUse: It can be used for home movable doors, wardrobe, large iron doors, curtains, automatic equipment pulley components, and factory track pulley. .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Trolley Assembly