Features Stable Sliding: 8 wheel design ensures smooth rolling performance with good stability, and the operation is very safe and easy with low noise. Good Structure: Adopting rolling bearing, the trolley assembly has been through fine welding and CNC crafting to form highly sturdy structure. Extensive Uses: Allows for wide application on home movable doors, wardrobe, large iron doors, curtains, automatic equipment components, etc. Steel Material: The utilization of premium stainless steel, aluminum alloy and nylon materials enables excellent durability against rusting. Easy to Install: Comes with a compact size and a light weight as well, the trolley roller is very convenient to install within several minutes. Specification: Item Type: Hoist Trolley Material: Stainless steel, aluminum alloy, nylon. Applicable Scenarios: For indoor, bathroom, kitchen, balcony.  Package List:1 x 2 Way Buffer Pulley1 x Bearing Pulley2 x Toggle Fastener1 x Lower Limit Positioning Accessory1 x Screw Fastener Kit1 x Adjusting Wrench1 x User Manual Note:Please purchase the corresponding and applicable guide rail according to the pulley separately. Package List 1 x 2 Way Buffer Pulley 1 x Bearing Pulley 2 x Toggle Fastener 1 x Lower Limit Positioning Accessory 1 x Screw Fastener Kit 1 x Adjusting Wrench 1 x User Manual