The timing wheel is made of aluminum alloy with high . It can be used together with synchronous belt to realize synchronous transmission and transmission engineering smoothly. It is widely used in mechanical transmission 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 2 The transmission 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 transmission range. It can be used for long-distance transmission. 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: Metal colour: Silver Package Contents: 1 x timing pulley 2 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.