General description High-quality replacement wheels designed for luggage, bags, backpacks, and travel cases. These heavy-duty rubber universal swivel casters provide durability and flexibility for smooth transport. Technical specifications Wheel diameter: 50mm Thickness: 18mm Axle length: 36mm Bearing inner diameter: 21mm Inner diameter: 6mm Load capacity: Up to 51kg per suitcase Installation Simple installation process that can be done without professional guidance. Ensure wheels are firmly seated for optimal gliding performance. Usage Ideal for replacing worn-out wheels on luggage and bags. Easy to clean; wheels can be removed for thorough cleaning. Other information Buyers should measure the following to ensure proper fit: 1. Original outer diameter of the wheels. 2. Inner width of the wheel groove. 3. Length of the axle without nuts. 4. Thickness of the bearing hole width.