General description These 4PCS 50mm suitcase casters are designed for heavy-duty use, providing a reliable replacement option for your luggage, suitcase, or backpack. Made from high-quality materials, these mute rubber universal swivel wheels ensure a smooth and quiet rolling experience. Technical specifications Wheel diameter: 50mm Thickness: 18mm Axle length: 36mm Bearing inner diameter: 21mm Inner diameter: 6mm Load capacity: Up to 51 kg per suitcase Installation Simple installation without professional instructions Ensure proper tightness of the wheel for optimal rolling Usage Ideal for replacing worn-out wheels on suitcases, luggage, and backpacks Easy to clean; wheels can be removed for thorough cleaning Other information Buyers should measure the following suitcase wheel data for compatibility: 1. Original outer diameter of the wheels 2. Width of the wheel groove 3. Length of the screw (without nut at both ends) 4. Thickness of the tube diameter bearing bore width