Perfect Grip Keychron Aluminum Knob Featuring textured sides to allow the perfect amount of grip and offering multiple unique color options to choose from, the Keychron aluminum knob can be easily and safely installed onto the Q or V series keyboards (Only compatible with knob version). Productive And Effortless You can easily pull out the original knob and install the new one, which largely saves the time spent on using tools. Specs Electrolytic Process: Anodizing (*Note: Color white is manufactured by powder coating.)Outer Diameter: 16 mmInner Diameter:  13 mmHeight: 14 mmCompatible Keyboards: Q series keyboard knob version and V series keyboard knob versionDownload Keychron Aluminum Knob 3D File here.