Features High Strength Construction: Made from solid steel, this 4 Wheel Trolley Assembly offers superior strength and impact resistance, ensuring durability for heavy sliding doors Stable and Silent : Equipped with standard deep groove ball bearings, our Silent Trolley Assembly Roller provides a smooth, noise- glide for effortl door movement Impact Resistant Design: The trolley assembly features thickened parts to absorb strong impacts, protecting the wheels and enhancing longevity for all sliding door applications Enhanced Protection with Multi Layer Plating: This roller trolley benefits from multi layer plating, providing excellent resistance against acid, alkali, and erosion for long-lasting performance Quick and Easy Installation: The L Shaped Removable Insert Design allows for fast setup and removal, making it ideal for both DIY enthusiasts and profional installers Features: 1、High Strength: This stroller assembly middle support is made of solid steel, which is high strength and impact resistant and galvanized zinc plated for resistance. 2、Stable : The wheel trolley case is mounted with standard deep groove ball bearings, which are very sleek and noisel when in use. Welded bearing positioning ensures working stability. 3、Impact Resistant Head: In order to prevent strong impacts from damaging the wheels, the trolley assembly has been thickened with impact resistant parts. 4、Multi Layer Plating: This cart assembly utilizes multi layer plating to provide effective protection to the wheels and increase the acid, alkali and erosion resistance of the wheels. 5、L Shaped Removable Insert Design: This trolley assembly is designed with L shaped removable inserts for quick installation and easy removal. Specification: Item Type: Roller Trolley Material: Stainl Steel, Aluminum Alloy, Nylon Suitable Scene: Indoor, Bathroom, Kitchen, Balcony Package List: 1 x Roller Trolley 1 x Load Bearing Pulley 2 x Toggle Fastener 1 x Lower Limit Positioning 1 x Fixed Screw Pack 1 x Adjustment Wrench 1 x Manual Note: Please purchase the corresponding size of the applicable rail separately according to the pulley. Package List 1 x Roller Trolley 1 x Load Bearing Pulley 2 x Toggle Fastener 1 x Lower Limit Positioning 1 x Fixed Screw Pack 1 x Adjustment Wrench 1 x Manual