Features: Enhances your 3D printing experience with our Extruder Coated Gear Kit. Features integrated designing for improved gear concentricity and smoother filaments transmission. Crafted from hollowed gears with a high reduction ratio, this kit offers increased extrusion torqued and precise thanks to precise bearings and high strength mold steel feed gears with coating. For 3D printing enthusiasts, professional designers, and engineers elevates their print and achieve precise result. Perfectly for use in various 3D printing applications, ensuring stable and lineared power transmission through its helicaled gear designing, which enhances meshing performances and reduces stress. Specifications: Name: 3D printer Extruder Gear set Size: about 21x21mm/0.83x0.83in Component：Metal Bearing: Precise bearings Surfaces HV Hardness 1000-1200 Gear Hardness 62-65 Package Includes: 1Set Extruder Gear set note: Due to the problems of lighting effects, there will be certain tolerances in the product, please understand. Please allow 0-2mm error due to manual measurement.