Feature:1. CARBON STEEL MATERIAL: The pulley is made of high strength carbon steel, with high hardness, robustness, and impact resistance. CNC accuracy machining technology, full penetration welding. Two 8 wheel trolley components with a load capacity of up to 2700 pounds.2. STRONG STABILITY: Assembled using an 8 bearing wheels with welded bearings and pin shafts, it has stronger stability and is safe to use.3. SILENT OPERATION: The pulley uses deep groove ball bearings to ensure smoothly operation without generating any noise.4. EXCELLENT PERFORMANCE: Our 8 wheels trolley assembly have impact resistance and galvanized properties, providing rust and corrosion protection. It also has a sturdy bearing steel pin shaft in the pillar channel.5. WIDELY APPLICABLE: The pulley assembly can be used for household moving doors, wardrobe cabinets, large iron doors, curtains, automation equipment pulley assemblies, factory track pulleys, etc.Specification:Item Type: 8 Wheels Trolley AssemblyMaterial: Carbon SteelApplication: Can be used for family activity doors, wardrobes, large iron doors, curtains, automation equipment pulley components, and factory track pulleys..Package List:2 x 8 Wheels Trolley Assembly