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. Item Type: 8 Wheels Trolley Assembly Material: Carbon Steel Application: Can be used for family activity doors, wardrobes, large iron doors, curtains, automation equipment pulley components, and factory track pulleys. 2 x 8 Wheels Trolley Assembly