Feature: 1. Set Content: There are four synchronous wheels, two belts and one hex wrench in our synchronous wheel set, which is enough for you to put into practical use. 2. Aluminum Alloy Synchronous Wheel: The synchronous wheel is made of aluminum alloy with oxidized finish, fine workmanship and high transmission accuracy. 3. Rubber Belt: The belt in our set is made of rubber material, durable and elastic, long service life, bringing you an unparalleled experience. 4. Energy Saving Effect: The belt and synchronous wheel in the set are easy to install and disassemble, with stable transmission, accurate tooth pitch, high transmission efficiency and excellent energy saving effect. 5. Widely Applied: Our synchronous wheel set is widely applied to 3D printer, milling machine, gear grinding machine, drilling machine, CNC lathe, gear hobbing machine or other mechanical transmission situations. Specification: Item Type: Synchronous Wheel Set Material: Aluminum alloy, rubber Timing Belt Length: Approx. 400mm/15.75in Timing Belt Width: Approx. 6mm/0.24in Teeth: 20T and 60T Screw: M4 . Package List: 4 x Synchronous Wheel2 x Belt1 x Hex Wrench