Perfect design: This wheel features a round 4-hole design that is easy to install and remove. Due to variations in production batches, the hole spacing between the suitcase and wheels may differ slightly. If necessary, minor adjustments may be required by modifying the holes on the suitcase. The wheel is lightweight, heat-insulating, moisture-proof, flame-retardant, and easy to use. Made from high-quality black plastic material, it is durable and wear-resistant, suitable for most suitcases and compatible with standard luggage. Some DIY installation ability is required. This wheel set is designed for use with bags, suitcases, and trolley cases, and serves as a great replacement option. The product includes left and right parts, with the base clearly marked for correct installation. If the assembly is not suitable, please replace accordingly. Note: 1. Please allow slight variations due to manual measurement. 2. Color may vary slightly due to differences in monitor displays.