The timing wheel is made of aluminum alloy with high finish. It can be used together with synchronous belt to realize synchronous mission and mission engineering smoothly. It is widely used in mechanical mission of 3D printers, drilling machines, milling machines, gear machines, CNC lathes, etc.Aperture: 8mm/0.31 inch; Maximum diameter: 55 mm/2.16 inch; Total height: 18mm/0.7inch; Groove width: 7mm/0.27 inch; Pitch: 2mm/0.08 inch; Thread: M5 x 2The mission is accurate, stable, and efficient. It does not slide when working. It has buffering and damping functions, low noise, convenient maintenance, and no lubrication. It has a large power mission range. It can be used for long-distance mission.First remove the belt pulley, install the belt on the belt pulley, and then install the belt pulley on the shaft to fix it.Tip: Please check the timing pulley specification before ordering. Material: Metalcolour: Silver Package Contents:1 x timing pulley2 x screw Only the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.