:Durable MaterialMade of high-quality aluminum metal with bright surface, sturdy and durable structure, low noise, easy maintenance, no need to lubricate during use.More AdvantageThe transmission is accurate and stable with high efficiency, there is no sliding when working, it has the functions of buffering and damping, low noise, convenient maintenance, and no lubrication.Use With Timing BeltUsed in conjunction with the synchronous belt, it can realize the smooth progress of the synchronous transmission and transportation project.12mm WidthHigh transmission efficiency, good energy-saving effect, especially suitable for linear motion and positioning, suitable for 12mm width synchronous belt.Wide ApplicationIt is widely used in mechanical transmission, such as 3D printers, drilling machines, gear machines, etc., which can effectively improve work efficiency.Specification:Material: aluminumColor: silverFeature: energy-saving, durableSize(approx.): (intermediate diameter x overall diameter x bottom height x overall height)1.2 x 5.5 x 0.7 x 1.8cm/0.47 x 2.17 x 0.28 x 0.71inchPackage Included:1 PC x Synchronous Wheel2 PCS x ScrewNote:1.Due to the light and screen difference, the item& 039;s color may be slightly different from the pictures.2.Please allow 1-2 cm differences due to manual measurement.