Material: Iron. Color: Silver. Weight: 135 grams. Dimensions: 7.1 x 2.8 x 1.6cm. (see photo for more details) Quantity: 2 Product information: Made of iron, strong and durable, high strength, good stability and low creep. Good wear resistance and chemical stability can be used for a long time. Product advantages: The double bearings and their structure ensure the stability and smoothness of the door when rolling. Reduce vibration, reduce noise and ensure smooth operation. Ideal for indoor or outdoor use. Wide range of uses: spare parts, gate wheels, sliding fences, sliding window bearings, 3D printers, shower screen bearings, tank washers, dog gates, garden gates, wire rope guides, etc. Perfect for a professional (industrial setting) or as a handyman. Ease of use: Easy to install and use. For experienced and non-professional users. The diameter of the wheel is 15mm, the height of the wheel is 28mm, and the depth of the U-shaped groove is 4mm. The U-shaped groove adapts perfectly to the recoil track. Precautions for use: The maximum weight is 40 kg. Iron is the main material, please dont use it in humid environment. Product information: It is designed with silver metal double rollers, simple and convenient to use. use. Great accessory for entry doors, windows, sliding doors, etc. The double roller bearing glides smoothly and smoothly, making the gate easy to operate. drag.