Product InformationMade of iron, strong and durable, high strength, good stability and small creep. Good wear resistance and chemical stability, can be used for a long time. [Product advantages] The double bearing and its structure ensure the stability and smooth running of the door. Reduce vibration, reduce noise and ensure smooth operation. Ideal for indoor or outdoor use. WIDELY USEDUses: Replacement Parts, Door Wheels, Sliding Fences, Sliding Window Bearings, 3D Printers, Shower Screen Bearings, Can Washers, dog gates, garden gates, wire rope guides, etc. Suitable for professional (industrial) or as a do-it-yourselfer. Easy to useEasy to install and use. Suitable for experienced and non-expert users. The diameter of the wheel is 15mm, the total height of the wheel is 28mm, and the depth of the U-shaped groove is 4mm. The U-shaped groove fits the reverse track perfectly. [Precautions for use] The maximum load capacity is 40 kg. Iron is the main material, please don't use it in humid environment.