General description Replacement suitcase casters designed for heavy loads, these 50mm mute rubber universal swivel wheels are perfect for luggage, backpacks, and travel gear. The set includes 4 pieces, ensuring a smooth and durable rolling experience. Technical specifications Bearing inner diameter: 21 mm Inner diameter: 6 mm Wheel diameter: 50 mm Thickness: 18 mm Length of axle: 36 mm Load capacity: up to 100 kg per suitcase Weight: 51 kg without deviation for safe and reliable use Installation Simple installation without professional instructions Waterproofing of the wheel is recommended during installation for optimal performance Usage Easy to clean; wheels can be removed for thorough cleaning Buyers should measure the following for compatibility: 1. Original outer diameter of the wheels 2. Inside groove width of the wheel 3. Length of the screw (without nut at both ends) 4. Thickness of the tube diameter width of the bearing bore