【Product Information】 Made of iron. Robust, durable, high strength, good stability, and low creep. Good wear resistance and chemical stability allow for long-term use. 【Product Advantages】 The double bearings and structure ensure stability and smooth operation when the door rolls. Reduces vibrations and noise, ensuring smooth operation. Perfect for indoor and outdoor use. 【Widely Used】 Applications: spare parts, door wheels, sliding fences, sliding window bearings, 3D printers, shower cabin bearings, washing machines, dog doors, garden gates, wire guides, etc. Suitable for professionals (industrial environments) or DIY enthusiasts. 【Easy to Use】 Easy to install and use. Suitable for both experienced and non-experts. The wheel diameter is 15 mm and the total wheel height is 28 mm. The U-shaped groove is 4 mm deep. It fits perfectly on inverted tracks. [User Information] Maximum load capacity: 40 kg. Made of iron. Do not use in humid environments. If you have any questions about the product, please contact us first.