Feature: 1. Accurate Transmission: The synchronous pulley does not slip when working, the transmission ratio is constant, and the performance is stable. 2. Aluminum Alloy Material: The synchronizing wheel is made of aluminum alloy, with surface oxidation treatment, durable, fine workmanship and high transmission accuracy. 3. Rubber Belt: The timing belt is made of fiber reinforced rubber, which is elastic, has good anti skid effect and has a long service life. 4. Excellent Performance: This synchronous wheel has stable transmission, precise tooth pitch, high transmission efficiency and good energy saving effect. 5. Widely Use: This synchro wheel can be used in 3D printers, milling machines, gear grinding machines, drilling machines, CNC lathes, gear hobbing machines or other mechanical transmission situations. Specification: Item Type: Timing Belt Pulley Material: Aluminum alloy and rubber Timing Belt: Length: Approx. 610mm / 24in Width: Approx. 6mm / 0.2in Number of Teeth: 20 and 60t Screw: M4. Package List: 4 x Synchronous Wheel 2 x Timing Belt1 x Hex Wrench