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.