Features Stable And Safe Design: The trolley assembly features a welded bearing and pin system with 4 bearings, ensuring enhanced stability and safety during Smooth And Quiet : Equipped with deep groove ball bearings, this assembly guarantees a seaml and noise- experience, for any environment High Load Capacity: Each 4 wheel trolley assembly is engineered to support a design load of up to 550 lb, providing reliable performance for heavy-duty applications And Easy To Maintain: Crafted from solid alloy steel, the U-shaped pulley assembly is not only impact resistant but also easy to clean, ensuring long-lasting use Versatile Applications: This trolley assembly is ideal for various setups, including home trolley doors, wardrobe cabinets, large iron doors, and factory track pulleys Features: 1、STABLE AND SAFE: Trolley assembly using welded bearing and pin of 4 bearing, more stable, safe use 2、NOISEL BEARINGS: Trolley assembly uses deep groove ball bearings to ensure that you can operate smoothly without any noise 3、LOAD BEARING AND IMPACT RESISTANT: Each four wheeled trolley assembly has a design load of 550lb. The roller trolley assembly is made of impact resistant solid alloy steel 4、 RESISTANT ALLOY STEEL: U shaped pulley assembly is made of solid alloy steel with high strength, resistance and easy cleaning 5、WIDELY USED: Trolley assembly can be used in home trolley doors, wardrobe cabinets, large iron doors, curtains, automatic equipment pulley assembly, factory track pulleys Specification: Item Type: Trolley Assembly Material: Alloy steel Color: Silver Application: Used for household movable door, wardrobe, large iron door, curtain, automatic equipment pulley assembly, factory track pulley Package List: 1 x Trolley Assembly Package List 1 x Trolley Assembly