Product InformationMade of iron, sturdy, durable, high strength, good stability, low creep. Good wear resistance and chemical stability, can be used for a long time. Product advantages Double bearings together with its structure can ensure stability and smoothness when the door is rolling. Reduce vibration, reduce noise and ensure smooth operation. Ideal for internal or external use. Widely Used Usage: Spare Parts, Door Wheels, Sliding Fence, Sliding Window Bearings, 3D Printer, Shower Screen Bearings, Can Washer, Door for dogs, garden gates, wire rope guides, etc. Suitable for professional (industrial context) or as a DIYer. Easy to useEasy to install and use. For experienced and non-expert users. Wheel diameter is 15mm, wheel overall height is 28mm, U-groove depth is 4mm. The U-shaped groove can fit the inverted track perfectly. Notes for use Maximum load capacity 40 kg. Iron as main material, do not use in humid environment. If you have any questions about the product, please contact us first.