Note: The color of the product we ship is the color in the first picture, and the specification and quantity are shipped according to the quantity and specification described in the title. If you need to change the color or style, you need to contact us within 12 hours after placing the order. Our product description: Product Features: 1.Every product has a unique Manufacturing Part Number label on the inner package that proves it has been qualified,which include Part Number,Model Number and inspection date information 2.If you have any questions about the item,please provide us the Manufacturing Part Number for checking,your profits will be guaranteed.3.Made of PP and steel.4.Use for electric door, sliding gate etc.5.With two built-in 6201 bearings.6.Application:Electric door on the wheel, sliding door nylon sleeve wheel, iron door by wheel, electric door guide wheel, track wheel, pulleySpecifications:Product material: PP and SteelColor: Yellow and SilverBrand name: BQLZRWheel Size: approx 50 x 70mm or 1.97 x 2.76inch(Dia x H)Total Height: approx 107mm or 4.21inchScrew Type: M12Weight: 502gPackage include:2 x Guiding Wheels Note: Because the model and display effect of the monitor may be different, there may be slight differences in color, and the size is manually measured, there may be an error of 1-2cm, please understand.