The timing wheel is made of aluminum alloy with high finish. 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. First remove the belt pulley, install the belt on the belt pulley, and then install the belt pulley on the shaft to fix it. 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. Tip: Please check the timing pulley specification before ordering., Weight: 0.16314207388 Pounds, Manufacturer: Tuidzljd