Features: Brand new and high quality Material: Made of high quality aluminum alloy, Surfaces oxidation treatments,durable, fine workmanship and high transmission accuracy Accurate transmission: without slipping work, having a constant gear ratio Smooth transmission, precise tooth pitches, High transmission efficiency, energy-saving effect Simple structure: Easy to install, easy to assemble and disassemble Application Scope:Widely used in milling machine, gear shaperness, drilling machine, hobbing machine or other machine transmission occasion Specifications: Material: Aluminum Alloy Color: Silver Number of tooth: 20&60T Bore Diameter: 8mm/0.31inch Length of timing belt: 200mm/7.9inch Width of timing belt: 6mm/0.24inch Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 2Pcs GT2 60 Teeth 8mm Bore Synchronous Wheel 2Pcs GT2 20 Teeth 8mm Bore Synchronous Wheel 2Pcs Length 200mm Width 6mm Belt 4Pcs screws