Item Type: Synchronous Wheel_x000D_ Material: Alloy Steel_x000D_ Pitch: Approx. Approx. 2mm / 0.08in_x000D_ Number of Teeth: 80T_x000D_ Outer Diameter: Approx. 55mm / 2.17in_x000D_ Flange: Dual Flange_x000D_ Fixing: 2 x M4_x000D_ Pulley Timing Diameter: Approx. 5mm / 0.2in_x000D_ Applicable Belt Width: Approx. 6mm / 0.24in 1Reliable Work: Works perfectly with timing belt, the synchronous wheel enables stable transmission in linear motion and positioning. 2Broad Utility: Widely applied in 3D printers, CNC, milling machines, gear forming machines, drilling machines, CNC lathes and so on. 3Better Design: Comes with 5mm inner diameter, this 80T GT2 high accuracy synchronous pulley is applicable to 6mm width timing belt. 4Good Material: Mainly made from premium alloy steel material, waterproof and rustproof, also has excellent durability for long uses. 5Easy to Install: Compact in size and light weight as well, the installation can be quickly finished with hex wrench and M4 screw hole. 1 x Synchronous Wheel 1 x Hex Wrench