Features 1、Reliable Work: Works perfectly with timing belt, the synchronous wheel enables stable transmission and high working efficiency. 2、Broad Utility: Widely applied in 3D printers, CNC, milling machines, gear forming machines, drilling machines, CNC lathes, etc. 3、Better Design: With 2pcs rubber timing belt with 852mm length and 6mm width, there are 2 sets synchronous wheel with 20T and 60T. 4、Good Material: Mainly made from premium alloy steel material, not likely to deform and also has great durability for long uses. 5、Easy to Install: Small in size and light in weight, the installation can be quickly finished with hex wrench and M4 screw hole. Specification Item Type: Synchronous Wheel Material: Aluminium alloy, rubber. Timing Belt Length: Approx. 852mm / 33.54in Timing Belt Width: Approx. 6mm / 0.24in Teeth: 20T, 60T. Screw: M4 Package List 4 x Synchronous Wheel 2 x Belt 1 x Hex Wrench