[Product Information] Made 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 and its structure can ensure stability and smoothness when the door is rolling. Reduces vibration, reduces noise and ensures smooth operation. Ideal for internal or external use.[Widely Used] Use: replacement parts, door wheels, sliding fence, sliding window bearings, 3D printer, shower screen bearings, bottle washer, dog door, garden gates, wire rope guides, etc. Suitable for professional (industrial context) or DIY enthusiast.[Easy to Use] Easy to install and use. For both experienced and non-expert users. The wheel diameter is 16mm, the total height of the wheel is 28mm, the depth of the U-shaped groove is 4mm. The U-shaped groove can perfectly fit the reverse track.[Notes for use] Maximum load capacity 40kg. Iron as the main material, do not use in a humid environment.Delivery quantity: 2 pieces,"