Features:*Precise transmission: Made of fantastic aluminium alloy with oxidation treatment, our GT2 timing belt pulleys present high transmission accuracy and prevent slippage during .*Frictionless transmission: With precise enamel spacing and high transmission efficiency, our timing belt pulleys present mushy transmission and save energy.*Easy installation: Our timing belt pulleys have an easy constitution and are smooth to install, construct and disassemble.* and finely crafted: Our timing belt pulleys are manufactured from advantageous aluminium alloy and offer high sturdiness and superb workmanship.*Versatile application: Our timing belt pulleys are widely used in milling machines, tools mills, drilling machines, rolling machines or other machine transmission.Specifications:Colour: silverMaterial: aluminium alloyNumber of teeth: 20&80Transmission ratio: 1:4Installation aperture: Φ8mm/Φ10mmBelt length: 250mmBelt width:6mmPackage Included:2*Synchronous Wheel 1*Belt2*WrenchNote:1. The genuine colour of the article could also be barely diverse from the pictures shown on website brought on by many factors equivalent to brightness of your computer screen and light brightness.2. Please enable slight manual dimension deviation for the data.