Features: Brand new and high quality Integrated shaft design, the gear will not fall, ensuring better concentricity of the gear, reducing the eccentric rotations of the gear due to assembly, and ensuring the gear to transport filaments more evenly. The problem of inconsistent extrusion of filaments in extruder are solve. The gear adopts double bearings, with smaller clearances Highly strength die steel is used, and Nanometer-coating is used for treatments. The overall hardness of the gear reaches 62-65; The surfaces hardness reaches 1000-1200, which greatly ensures the strength, wear resistance and corrosion resistance of the gear, improves the bearing capacity of the gear and prolongs the service life of the gear. Specifications: Material:Metal Length:Approx.3cm/1.18inch Package Includes: 1 Set Extruder Gear note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.