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Size: 5mm to 5mm bore with L20xD12 dimensions, fits most small motors and shafts. Wide Use: Ideal for 3D printers, CNC machines, DIY robots, RC models, and motor accessories. Material: Made of aluminum alloy for high strength, wear resistance, and long service life. Rigid Coupling: Provides firm shaft connection without flexibility, ensuring precise torque transmission. Package: Includes 4 couplers in red finish, offering reliable spares for multiple projects.