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 20 Teeth 8mm Bore Synchronous Wheel 1pcs 80 Teeth 8mm Bore Synchronous Wheel 1pcs 200mm Girth 6mm Width Belt 1pcs Wrench Timing Pulley Specifications: Max Diameter: 16mm/0.63 inch; 55mm/2.16 inch Total Height: 16mm/0.63inch; 18mm/0.7 inch Slot Width: 7mm/0.27inch Pitch: 2mm/0.08inch 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. It can be used for long-distance transmission. How to use it Remove the pulley first, install the belt on the pulley, and then install the pulley on the shaft to fix it, the wrench help install and remove screws. What should I notice Tips: Please check the timing pulley and belt specifications before ordering.