Check the listing for details. 40 Teeth 8mm Bore Timing Pulley Synchronous Wheel Silver. Condition: New. Listed at 10.19 USD. What is this?The synchronous wheel is made of aluminum alloy with a high finish. Used in conjunction with timing belts, realize synchronous transmission and transfer project smoothly. Widely used in mechanical transmission such as 3D printers, drilling machines, milling machines, gear machines, CNC lathes, etc.What will I get?Package Content: 1pcs x Timing Pulley Wheel(with screws); Bore Diameter: 8mm/0.3inch; Max Diameter: 28mm/1.1inch; Total Height: 21mm/0.83inch; Slot Width: 11mm/0.43inch; Pitch: 2mm/0.08inch; Thread: M4*2.Are there any advantages of the product?The 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. Has a large power transmission range.