Material - Made of high quality aluminum alloy. Key benefits - Small size and light weight for easy integration into compact systems. - Compact and portable design that fits a variety of devices and setups. - Easy to install, delivering a straightforward setup process. - Sturdy and durable construction for reliable long term use. - High precision to support accurate rotational performance. - Long service life suitable for continuous operation in demanding applications. Compatibility and use cases - Ideal for 3D printers, connected motors, stepper motors, encoders, threads, and general machinery. - Suitable for projects that require precise shaft sizing and durable coupling options. Dimensions and compatibility options - Upper shaft diameter options: 5 mm, 6 mm, 6.35 mm, 8 mm - Bottom shaft diameter options: 5 mm, 6 mm, 8 mm, 10 mm Use scenarios - 3D printer upgrade or repair: match the shaft to a motor or encoder to restore or improve motion accuracy. - Stepper motor or CNC machine integration: connect components with compatible shaft diameters to ensure firm and precise coupling. - Encoder installation and motor coupling: use correct diameter combinations to achieve reliable feedback and smooth operation. Notes - Please choose the appropriate upper and bottom shaft diameter combinations to match your equipment requirements.