Features:*Precise transmission: Made of advantageous aluminium alloy with oxidation treatment, our GT2 timing belt pulleys provide excessive transmission accuracy and forestall slippage during .*Frictionless transmission: With exact teeth spacing and excessive transmission efficiency, our timing belt pulleys provide soft transmission and save energy.*Easy installation: Our timing belt pulleys have a straightforward structure and are smooth to install, construct and disassemble.* and finely crafted: Our timing belt pulleys are made of fine aluminium alloy and offer excessive durability and high quality workmanship.*Versatile application: Our timing belt pulleys are widely used in milling machines, tools mills, drilling machines, rolling machines or different mechanical device 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 real coloration of the article could also be slightly diverse from the images proven on online page brought on by many factors such as brightness of your video display and light-weight brightness.2. Please enable slight handbook dimension deviation for the data.